Nothing simpler...
http://www.cyber-mailer.com/lists/ for an example of what I have done. The code is roughly like this....
<table width="96%" height="238" border="0" cellpadding="0" cellspacing="0">
<form method=post action=http://www.site.com/signup.php> <tr>
<td height="238" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td><table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="50%" align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">First
Name:</font>
<input type=text name=fname size=20>
</td>
<td width="50%" align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Email
Address:</font>
<input type=text name=email>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="50%" align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Last
Name: </font>
<input type=text name=lname size=20>
</td>
<td width="50%" align="center"><input type=hidden name=sup>
<input type=submit name=sup value="Sign Me Up Scotty!">
</td>
</tr>
</table>
</td>
</tr>
</table>
<table width="100%" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<td width="52%" bordercolor="#CCCCCC" bgcolor="#FFFF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=42>
<font color="#FF0000">Animals</font></font></td>
<td width="48%" bgcolor="#FFFF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=43>
<font color="#FF0000">Antiques</font></font></td>
</tr>
<tr>
<td bgcolor="#00FF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=22>
<font color="#0000FF">Automobiles</font></font></td>
<td bgcolor="#00FF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=23>
<font color="#0000FF">Affiliate & MLM</font></font></td>
</tr>
<tr>
<td bgcolor="#FFFF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[]2 value=24>
<font color="#FF0000">Arts & Entertainment</font></font></td>
<td bgcolor="#FFFF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[]3 value=25>
<font color="#FF0000">Business & Finance</font> </font></td>
</tr>
<tr>
<td bgcolor="#00FF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=26>
<font color="#0000FF">Computers & Internet</font></font></td>
<td bgcolor="#00FF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=44>
<font color="#0000FF">Coupons & Discounts</font></font></td>
</tr>
<tr>
<td bgcolor="#FFFF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=27>
<font color="#FF0000">Cultures & Community</font></font></td>
<td bgcolor="#FFFF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=28>
<font color="#FF0000">Cyber Dating</font></font></td>
</tr>
<tr>
<td bgcolor="#00FF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=29>
<font color="#0000FF">Games</font></font></td>
<td bgcolor="#00FF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=30>
<font color="#0000FF">Government & Politics</font></font></td>
</tr>
<tr>
<td bgcolor="#FFFF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=31>
<font color="#FF0000">Health & Wellness</font></font></td>
<td bgcolor="#FFFF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=32>
<font color="#FF0000">Hobbies & Crafts</font></font></td>
</tr>
<tr>
<td bgcolor="#00FF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=33>
<font color="#0000FF">Home & Family</font></font></td>
<td bgcolor="#00FF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=45>
<font color="#0000FF">Jewelery</font></font></td>
</tr>
<tr>
<td bgcolor="#FFFF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=46>
<font color="#FF0000">Kidz Thingz</font></font></td>
<td bgcolor="#FFFF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=34>
<font color="#FF0000">Music</font></font></td>
</tr>
<tr>
<td height="19" bgcolor="#00FF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=35>
<font color="#0000FF">Religion - Eastern</font></font></td>
<td bgcolor="#00FF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=36>
<font color="#0000FF">Religion - Christian</font></font></td>
</tr>
<tr>
<td bgcolor="#FFFF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=37>
<font color="#FF0000">Religion - Middle Eastern</font></font></td>
<td bgcolor="#FFFF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=38>
<font color="#FF0000">Religion - New Age</font></font></td>
</tr>
<tr>
<td height="19" bgcolor="#00FF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=47>
<font color="#0000FF">Rural</font></font></td>
<td bgcolor="#00FF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=39>
<font color="#0000FF">Schools & Education</font></font></td>
</tr>
<tr>
<td height="19" bgcolor="#FFFF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=48>
<font color="#FF0000">Sci-Fi</font></font></td>
<td bgcolor="#FFFF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=40>
<font color="#FF0000">Science & Technology</font></font></td>
</tr>
<tr>
<td bgcolor="#00FF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=49>
<font color="#0000FF">Senior Citizens</font></font></td>
<td bgcolor="#00FF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=41>
<font color="#0000FF">Sports & Recreation</font></font></td>
</tr>
<tr>
<td height="19" bgcolor="#FFFF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=50>
<font color="#FF0000">Specialty Shopping</font></font></td>
<td bgcolor="#FFFF00"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type=checkbox name=lists[] value=51>
<font color="#FF0000">Travel</font></font></td>
</tr>
</table>
<p><input type=hidden name=!da><input type=hidden name=!ip></p></td>
</tr></form>
</table>
<tr>
<td height="19"> </td>
</tr>
</table>
Hope that helps you.