From NormSoft's email:

The big changes include:

- Direct PLS support from the web browser. Tap on a PLS link and
Pocket Tunes will begin playing the music immediately. (You may be
prompted to download the file. Say "Yes" and/or "Open".)

- Non-blocking sockets means fewer lockups while loading ShoutCast
stations and fewer failures due to timeouts.

- Filenames sorted in Choose Songs screen (finally!)

- Improved buffering for ShoutCast streams. If you were getting
lots of "Buffering..." messages before, particularly while using
other Palm applications, please let me know if this beta is better.

- Fixed the problem that requires a soft reset after accessing a
bunch of ShoutCast streams.

- Lots more! See the beta page for details.