I released gecko-mediaplayer and gnome-mplayer 0.9.9 on 2009-02-05 and the release was decent for the most part. But compile issues where found with various flavors of libxul and there were some other problems with shoutcast and other websites.
So I reworked some code and found some bad problems. So I released a gecko-mediaplayer 0.9.9.1 only on the mailing list which was a snapshot of SVN as of 2009-02-08.
So expect a new release coming soon to fix some of these issues.