Palm and Handspring users will be waiting some time for a Mac OS X version of the Palm desktop. Handspring has received little information on the software because Palm hasn't yet released them a beta of the Desktop application. Until that happens, Handspring will not be able to begin work on developing a Visor-compatible version of Palm Desktop.
I got the impression that with the recent economic downturn, Mac development at Palm, Inc. is not a very high priority right now. It is unfortunate that Handspring has to keep waiting, as the Visor has been a hit with Mac users because of its out-of-the-box support for the Mac.
What I would really like to see is for Mac developers to take the Linux software that is available and port it to Mac OS X so Palm-compatible users can have a native HotSync.