Apple just sent me a free 6th Gen iPod nano after I returned my 1st gen iPod Nano as part of the recent recall. As happy as I am with getting a serious courtesy upgrade, I am really disappointed that iCal and Address Book is not supported. I use iCal a lot, and syncing my laptop calendar with my old nano was really convenient. I am missing the iCal sync already. I wish I didn't participate in the recall now as I was quite happy with my 1st gen nano.
I can now only hope that Apple will reintroduce iCal and Address Book software for the 6th gen iPod nano.
Apple will *never* give the Nano iCal or Address book syncing as the nano is strictly a music-player only.
If you want iCal/Address syncing, then the nano is not for you, the iPod touch is.