I suspect any of the FPGA boards could be adapted for IMEI cracking without any problems, that's a simple sha1 hash and would require even less communication bandwidth than Bitcoin mining. Been thinking about adjusting an Icarus board to solve work for yambamoney.com at some point if it shows signs of becoming more profitable than mining, but the whole Windows-only client thing is such a pain that I was hoping for a similar site (preferably paying in BTC) with a better API to build off of.
it's a VERY easy mod, the bigger job is writing a new client between the new service and the FPGA