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Yes, for non-CPU-intensive applications.

I'd run an ARM emulator on top of a x86 stack, but the R-Pi is not just an ARM machine..

For personal, non-commercial use only.

I've wanted a Raspberry Pi for a while, but I couldn't quite justify it. I also toyed with the idea of getting the $300 home edition of Mathematica (also limited to non-professional use, BTW), but again didn't have enough of a reason.

Although my preference is for free software (hadn't heard of either SymPy or Mathics mentioned elsewhere), I like the idea of plugging a Raspberry Pi into the router, and being an X session away from Mathematica.