Several new users of the Charlie aka the Nokia 6630 have mentioned the coolness of the Transfer application. This is a little program (Menu -> Tools on my phone) that is sent via Bluetooth to the phone you want to upgrade from. When it’s installed there, it sends all your information (contacts, calendar details etc) to the new phone. Painless.
The docs say that the 7610 and 6600 are supported, but I had no problems syncing with the N-gage classic.
Of course, you can use a sync with a PIM for this, but Transfer handles pictures too.
I mentioned it in the post linked above, but it’s such a nice feature I felt it should get a bit more attention.