I would like to have a PS3 for a workstation. I think it would kick butt!
I have read about folks that put Linux on a PS3, and it seems to work well.
I am not sure that using a Cell processor just to surf the Internet makes sense, but to each his own.
The Cell is just incredibly fast when you can tighten the code and run natively in the Cell. The is even a Beowulf Linux cluster that runs on eight PS3s, and it rocks.