The Motorola KRZR is the next of the RAZR-type phones, a great skinny flip phone that is carried by each of the major wireless networks. MicroSD, Bluetooth, MP3, and 2 MP camera are just some of the features of this clever little device.

Reviews
Cnet (T-Mobile)
Phonescoop
Phone Arena (lots of pics and in-depth study)

Resources
T-Mobile Support Site
Cingular Support Site
Motorola's Official Site