1. You can't 'capture' a person's email address, as mussavcom said. My next version will feature a check so that at least it's a valid address. Something similar to what's at the BYOF form.
If you go to http://twebman.lunarpages.com/perl/
and put in a faulty address. it'll kick back anything without an @ and at least one dot (.).
2. Not sure what you mean by 'look like' your form. If you use one of the more advanced scriptmakers, you can grab the form itself either as a whole web page, or as an html table with the form in it, propely set to use that script. You can then take that (either the form page or the form) and edit it however you like. Just don't remove or add fields, and don't rename any.
2a. Remember some of these, depending which script you use, may require hidden fields for subject and/or redirect location.
2b. If you used the simple (BYOF) one, any form will do, as long as the action is set to the script, and the script is properly uploaded and chmoded to 755. In that script, however, you NEED to have at least a hidden field called "L1" the value of which must be the url you want users sent to.
3. You can point as many pages as you like to a single script. If they are going to have different fields, make a BYOF script and point any forms you like to it.
I'm going to rework those script probably within the next month, and they'll have more options. I'm also trying to make it simpler. Any suggestions are welcome and will be considered (and probably implemented heheh).