Engadget has been busy today and have stumbled upon yet another Windows Phone 7 device in the wild. While the Samsung Cetus was an interesting find, the LG C900 is equally interesting.

Instead of relying on an on-screen keyboard, the LG will sport a side sliding QWERTY keyboard. But that's not the interesting part. What makes the LG really stand out is the AT&T logo that appears on one of the C900's tiles.

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The presence of the AT&T Logo is a strong indication that LG will have a spot in AT&T's Windows Phone 7 lineup that also is rumored to include the HTC Schubert and the Cetus.  Could we see more Windows Phone 7 devices headed to AT&T or is their lineup complete?