Windows Mobile/Symbian/BlackBerry/Android: If you've got an itch to flee your smartphone for another platform entirely, the prospect of manually dragging over your data is daunting. Sprite Migrate, a free transfer application, makes it easy to transfer pretty much everything.
Sprite's beta Migrate application, free until Dec. 1, should be installed on both the phone you have now and, when you get it, the phone you're moving to. From the phone being left behind, load up Migrate and tell it to grab bookmarks, call logs, contacts, SMS databases, photos, and anything else it can find. It dumps all that into a single file you can transfer by microSD or email, and you simply load up Migrate on a new phone and load that file in.
We lacked a second smartphone to grab and transfer Migrate data with, but Download Squad and online reviewers report that Migrate does exactly what it says. It's a free download for Windows Mobile, BlackBerry, Symbian and Android phones.