I believe .mac can do something like this, but I'd prefer to avoid paying for the pleasure of doing this as I don't need the other of .mac's features.... Ok, so I've got 2 Macs - my Intel iMac & Macbook Pro. What I want to do is to share/sync my user profile between the two. In an ideal world, this would mean any changes I do in Mail.app, iTunes, Safari, etc would be replicated to the other system. So I could read/write emails on both systems, read my RSS feeds, etc. The plan would be using one or other, so there shouldn't be any contention between the two.