Has anybody tried this yet? At the bottom of this link a developer created a PalmOS 3.5 version, so maybe it works for Handspring unlike the original.

http://www.jabbercentral.org/news/vi..._id=1026803386

For those of you not familiar with Jabber, I believe the desktop version connects to multiple Instant Messaging apps at one time, so I assume the Palm version does the same.