Sorry, I wasn't expecting to be hackernews'ed and pythex.org is running on a tiny Gandi.net slice with 256MB RAM. I'm temporarily redirecting it to a mirror in App Engine: http://pythex.appspot.com
Hope you can try it now!
Why not keep it on App Engine permanently so you don't have to worry about it going down again?
I'm glad there's a non-flash version of this, but if you use a mac, RegExhibit is awesome.
Great tip, I will check it out.I just saw there is a tool in the mac app store for 4.99 called patterns that looks pretty good too.