Samsung Captivate Glide
AT&T slide-out keyboard devices are few, but if you are looking for a powerfull smartphone with said feature, this might be your best bet. The Samsung Captivate Glide carries a good slide-out QWERTY keyboard along with some great specs.
This bad boy happens to feature an NVIDIA Tegra 2 processor, a Super AMOLED 4-inch display and 1 GB of RAM. Not too shabby. Especially if we consider that devices with physical keyboards and great specs are very few.