Canon EOS Rebel T3i/600D
18 megapixel CMOS sensor; Digic 4 processor; 3-inch tilt-and-swivel wide LCD, 1,041k pixels; 9 point auto-focus; 1080p HD video at 30, 25, and 24 fps; JPEG + RAW; 3.7 fps burst shooting; Canon EF-S 18-55mm f/3.5-5.6 IS kit lens; EF/EF-S lens mount; Captures to SD/SDHC/SDXC media cards; Rechargeable lithium-ion battery
The T3i (also known as the 600D outside of the US) is Canon's latest consumer-class dSLR, topping the T2i and sitting below the 60D. It's pretty much a T2i with a few features taken from the 60D, including a tilt-and-swivel screen, guide mode, and wireless flash functionality. It retains the same 1080p video mode as both cameras, too. The kit lens has had a minor tweak as well, although early indications are that it’s purely cosmetic.
Canon is sticking with its successful formula here, introducing an incremental upgrade that will keep the Rebel series competitive with the D5100 and Sony A55. It's probably not worth an upgrade from a T2i, but it for folks looking to upgrade from older or lesser Canon dSLRs, it's one more choice to consider. The chief complaint that we've heard so far seems to be aimed more at Canon's marketing tactics than the camera itself. Everyone loved the T2i, and this is a T2i with an articulating screen for a few extra bucks, so what's not to love? Furthermore, it could be considered a cheaper alternative to the 60D -- that camera is faster and has weather-sealing, but it's also an extra $200 that many folks would rather hang on to.