Sam Varshavchik wrote:
Is there a PDF viewer that supports fill-in forms?
I know about Adobe's reader, of course, but I'd prefer to use free
This question would be better suited to the fedora-list mailing list 
rather than this list, which is for development discussion.
That said, I'm not aware of a free/open-source PDF viewer that allows
filling our of forms. However, forms-support is planned for the Evince
reader (default in Gnome).
The Evince Roadmap wiki page  reads:
"Forms - this is a big one, but we could probably pick a
commonly used subset and get something useful Scheduled
for a Pre-April 2006 Release!"
Sounds like it's not there yet, but coming next year.