Jeff Pulver, founder of and voip pioneer, had this to say in his blog today:

To date while Skype for PalmOS has been just hype, in less than three weeks we will be demonstrating the ability to send/receive Instant Messages and share presence information from Free World Dialup on the PalmOS platform on a Treo600 with pulver.Communicator on Windows XP as well as with a HP PocketPC and our RIM devices..

So do you think they are trying for voip on the Treo 600 or just text? Interesting.