I just built a Flash forum (over the last week or so) combining Flash and PHP. If you care to try it out:
Downlaod: Coming soon. I'll have a distribuatable copy installable on your server.
Any comments would be appreciated.
Oh and one more thing. All the menu options are on the right click menu. I'm working on the lay out to put them elsewhere.
NOTE: It lags a little when loading data. I would recommend turning off animated windows and setting quality to low.