iCal calendar sync, perhaps?
... with the amazing help of Dave Smith and the gang at talk.maemo.org, I now have all my calendar and contact information regularly synchronized with my MacBook Pro via the Unofficial N900 iSync Plugin, a work of love and community that makes me so happy I could wet myself. All done without ever trusting a single bit of data to the cloud. Eat me, Android! On the laptop side, it’s sad that what Palm Desktop did in one application takes probably three to do otherwise. Still, upgrade that grade for the N900 to “A-” for PIM and compatibility!