The "trunk" series represents the primary line of development rather than a stable release branch. This is sometimes also called MAIN or HEAD.
The 0.7 series introduces support for more players, more applet features, and lots of bug fixes.
The 0.6 release series provides support for more players and additional UI features.
The 0.5 series of Panflute provides feature parity with the last release of Music Applet.
Series of Panflute PPA releases