BoingBoing pal R. Emory Lundberg just reviewed the apparently ubergruven Nokia 6600:
[The] all-in-one organizer, information manager, and mobile communicator that you may have been waiting for. If the Nokia 3650 was too playful for your lifestyle, you should consider this handset as a way to communicate, organize, and lighten the load in your pocket. Generally I prefer separate devices. I really like the Palm Tungsten T3 (review) and find it a very capable tool. But there are times when I just want my schedule and contacts with me, and don't need to work on Office documents on the go, and the Nokia 6600 has quickly become my handset of choice.