Version 0.5.1 of jsbrwsniff fixes the detection of Flash Player. It was not working with Flash Player >= 7.0 in Gecko browsers and not working at all in Internet Explorer due to a typo.
Version 0.3 of XSPF for Ruby is able to export XSPF playlists to M3U, SMIL, HTML and SoundBlox. These are minor features, but as a new dependency has been added (Ruby/XSLT), the version number has been upped to 0.3 instead of 0.2.1. I am currently developing the XSPF generator.