Have a look at the Advanced User Guide on p84 - Creating a Newsletter Subscription Form - as this contains some example code for radio buttons on the contact us form.
<tr>
<td> </td>
<td>Would you like to be placed on our mailing list?:</td>
<td><input type="radio" name="Maillist" value="Yes">Yes<input type="radio" name="Maillist" value="No" CHECKED/>No</td>
</tr>
This is accessed via Design|Contact Us
You will of course need to edit the mailform.pl for the info to be posted with the email. This, as Chris says is detailed in the Advanced User guide.
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