You can use the Address Book and iCal, choosing to synchronize your contacts, events and tasks with iSync, or you can use these same applications with the Missing Sync for Palm OS instead of using iSync. To use your Palm T|X with iSync, simply add it as a device using the Enable Palm OS Syncing… option under the Devices menu. [It must have a HotSync name different than the one used with your m101 if you intend to use both devices.]
There are lots of reasons to do so, including its far greater flexibility and reliability, its individual Mark/Space Contacts, Events and Tasks conduits, the far superior mapping of categories to groups across platforms, and the add-ons, like iTunes and iPhoto synchronization, AvantGo content synchronization, the OS X memo application and matching conduit…
The list goes on and on. You can learn more about the Missing Sync for Palm OS here:
http://www.markspace.com/missingsync_palmos.php