partial migration

Hi

My air should be here today, and I'm starting to wonder about how I migrate stuff to it from my imac?

I don't think I want to move everything, as my imac is the main machine. But I would like to move email settings and messages, internet bookmarks and perhaps a couple of other things. Also my music and photos, keeping iphoto 08 and itunes events/playlists etc. My docs I can just copy across


also, how do you go about making sure documents are synced between the two? Should I plan to move them to a network drive? My music doesn't change very often so I'm planning to have that stored locally on both imac and MBA for easy access. But photos and docs do change