Handspring has released Palm Desktop 4.0, offering full Mac OS X support for the first time.
If you are a Treo 180/270 user, you will have to manually configure any connection settings. Treo 90 users need to install the Wireless application suite as Handspring has not updated the installer yet for these additional applications. The Visor line has no issues.
The installer requires a reboot for some unexplicable reason, but at least it is finally here. Hopefully it will fix the problem I had with applications randomly reinstalling themselves.