can you can run webcams directly from it?!
Based on Seagate's description, I'd guess that the built-in firmware won't have camera drivers, but any recent Linux you install will at least have that option (if they aren't already included. Which is highly likely).
I wonder what resolution the 2 that pluggy is running are at, and how much it taxes the CPU to stream video from them. I'm really interested in the idea of a networked video camera (with pan and tilt via Arduino) for peanuts.