as I've got an amd64 ubuntu system, I just built gnash from cvs (as the release version 0.71 couldn't find my gtkglext headers)
It looks great! I had to muck around a little bit to get it to work in firefox:
- it wasn't finding the firefox plugins folder, had to set it manually in the Makefile - plugins.cpp line 685 - had to increase maxargc by one (no idea why, it was pretty much hardcoded anyway)
It really suprised me with how well it works though, and seems really close to being able to run some of the flash sites I visit on the net. If you need more bug testers, I'd be more than happy to help out, as I've written a fair bit of actionscript lately.
(if I can just help to get it working with homestarrunner.com, I'll be a happy lad :)
Also, is there a recommended Free fash developer's tool to go along with gnash? I'm about to try out qflash, but I'm sure the qt interface will probably suck a bit in gnome.