Jpop is a Java replacement for Winpopup. It allows popup messages to be sent to any machine which is capable of running Java. It also adds functionality to the basic popup messages, like clipboard sharing.
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This change is basically due to a few technicalities with 0.34. Pointless class files have been eliminated from the archive, and the colon problem really should be fixed now. In 0.34 colons no longer broke messages, but the colons themselves were eliminated.
Error handling in the GUI has been fixed (so that there is some). A disposal bug in the server code has been fixed. A bug which broke messages on a semicolon has been fixed, so you can now use it with URLs.