While still unannounced, the FCC recently put their stamp of approval on LG's CU320 slider phone. It looks to be headed to Cingular once their 3G network is up and running later this year.
Feature wise the LG CU320 sports:
No solid word on when the CU320 will ship, but the 3G network is very close to launching.
[via phoneArena and Engadget]