> > > I'm looking for the same thing as you, and I think I am going to go
> > > with www.thepetitionsite.com.  It just looks like the most established
> > > and most powerful of the available sites.
> >
> > Yes, that does look like it has handled a lot of petitions and a lot of
> > signatures.  In what sense is it powerful?
>
> I did end up going with this, and it (so far) has done everything I need. 
> It has kept all of my info confidential as a signer.  By default, it allows
> people to email you regarding your petition via a link on the petition
> page. You can turn this off in your preferences.  I has fit all of my
> needs.  Are there any features in particular that you are looking for?
>
After all of the dust settled, I would never go with www.thepetitionsite.com 
again.  At a certain time, it became necessary to email everyone who signed 
the petition.  There did not appear to be any way of doing this.  After 
contacting technical support, I was told that the only way to do this is to 
close the petition and enter a custom closing message.  I ended up 
prematurely closing the petition for this need.  Very frustrating...
At first the information privacy seemed like a really great thing.  The actual 
printable petition was great too, and so was the ability to allow signers to 
contact you.  The ability to do a mass mail is so important, though, and I 
didn't think to look for that before I chose a service.
I'm sure you've started your petition by now.  For future reference, anyone in 
need of a petition should look elsewhere.