The third beta release of Gnash has just been made at version 0.8.4. Gnash is a GPL'd SWF movie player and browser plugin for Firefox, Mozilla, and Konqueror. Gnash supports many SWF v7 features and ActionScript 2 classes. with growing support for SWF v8 and v9. Gnash also runs on many GNU/Linux distributions, embedded GNU/Linux, FreeBSD, NetBSD, OpenBSD, non x86 processors, and 64 bit architectures. Ports to Darwin and Windows are in progress for a future release. The plugin works best with Firefox 1.0.4 or newer, and should work in any Mozilla based browser using NPAPI. There is also a standalone player for GNOME or KDE based desktops.

Improvements since 0.8.3 release are:

* Keep Adobe happy with our users and our users happy with us by
changing "Flash player" into "SWF player" everywhere. Adobe
claims "Flash" as a trademark and had asked a Linux distributor
to fix it.
* The popular SWF Twitter badge now renders correctly.
* Fix parsing of urls containing multiple question marks
* Fix support for movies embedding multiple sound streams
* Support for loading PNG and GIF images added.
* Improved rendering of SWF movies because of the less visible
changes listed below.
* Support for writing RGB/RGBA PNG images and JPEG images.
* Works with Potlatch OpenStreetMap editor
* New 'flvdumper' utility for analyzing FLV video files.
* XPI packaging support for Mozilla & Firefox.

More Here