I'm having trouble posting this in the other thread, so I'm trying a new one.
I have a similar (same?) issue to the OP, on Leopard 10.5.8, fully updated. (Actually picked up a security update today too, hasn't impacted it either way.)
I can't launch PulpTunes from the icon, but it will launch fine from the terminal (once I have set the new Java as the default, obviously...):
Chriss-iMac:Java Chris$ java -jar PulpTunes.jar
23-01 18:31:51 INFO - XML Location: /Users/Chris/Music/iTunes/iTunes Music Library.xml
23-01 18:32:07 INFO - Getting external IP...
23-01 18:32:07 INFO - Server started. Listening on port 15000
23-01 18:32:08 INFO - External IP is: 95.149.252.97
Then all is well as far as I can tell, but trying to launch from the icon gives me this in the logs:
23/01/2010 18:38:56 [0x0-0x24024].com.pulptunes.com.pulpTunes.pulpTunes[323] [JavaAppLauncher Warning] Java application launched from PPC or bad stub. Relaunching in 32-bit, and tagging sub-processes to prefer 32-bit with $JAVA_ARCH=i386.
23/01/2010 18:38:56 [0x0-0x24024].com.pulptunes.com.pulpTunes.pulpTunes[323] [JavaAppLauncher Error] This process is [i386] and was re-exec'd from [i386], but for some reason we are trying re-exec to [].
23/01/2010 18:38:56 [0x0-0x24024].com.pulptunes.com.pulpTunes.pulpTunes[323] [JavaAppLauncher Error] unable to find a version of Java to launch
23/01/2010 18:38:56 com.apple.launchd[191] ([0x0-0x24024].com.pulptunes.com.pulpTunes.pulpTunes[323]) Exited with exit code: 1