The parallella board is far more interesting as a scrypt vehicle, but we need to wait for the 64 processor version for it to start to get interesting.
I read some talk about this on another forum, but now that Scrypt ASICs are appearing this board would have no hope against them. Scrypt pretty much just skipped FPGAs and went directly to ASICs as FPGAs give horrible Scrypt hashing performance. Though, this is exactly why Scrypt was implemented to make FPGAs and ASICs much less effective.