My friend Stewart Marshall took the plunge and also got an E61 after seeing mine. He ended up ordering from Expansys -- they look like a really great online store to order mobile gear from in Canada. I had noticed them before and will probably be getting a cheapo GPS unit from there to experiment with.
In any case, Stewart was asking about syncing with the Mac. There isn't an E-series compatible plugin for iSync yet, but there are various instructions for enabling this floating around.