Prawn will move from alpha development status to beta in a couple
weeks, when version 0.5 is released.
To help prospective users evaluate whether it’s time to take the
plunge, I’m collecting user stories on the Prawn mailing list from
those who have given it a try, and encouraging them to share code
samples and PDFs if they’ve done something they’re happy with. Once I
get some feedback, I’ll be writing an article to uncover the good, the
bad, and the ugly about the current state of Prawn, as well as our
plans for the future.
If you’re interested in this idea, please reply to the following
thread on the Prawn list. Aside from posting a link to the resulting
article in the Prawn 0.5 release notes, I don’t want to spam ruby-talk
further with Prawn-specific posts 
http://groups.google.com/group/prawn-ruby/browse_thread/thread/f7a7705589577e2d
-greg