> Are you saying that the petitioner cannot see the email addresses?  I'm OK
> with a system that has no automatic way of sending email to the
> signatories but I do need to be able to copy or download the list of email
> addresses if I'm going to contact them.
>
Yes, it is very annoying.  Another quirk with it: address and phone number are 
required when signing, in addition to name, email, location, etc.  I just 
assumed they would end up on the petition.  I thought this would be a good 
thing, because it would give the person the petition was presented to contact 
information to contact the signers. Only "name" and "comment" appeared on the 
printed petition.  
> But if I don't go to thepetitionsite.com, where should I go?
>
I'm not quite sure.  I would assume every site has some issues with it.  
Whatever site you do end up going with, make sure to keep us informed on how 
it worked for you.
You also might want to try finding a script and hosting it yourself.  See if 
there is anything on hotscripts.