[prezjordan]

GPUs were rendered useless by ASIC miners, no?

EDIT: Sorry for jumping on the Bitcoin hype train too soon! Many other uses for cracking hashes.

[profquail]

For bitcoins, yes. I believe OP is talking about password hash cracking, a la oclHashcat-plus: http://hashcat.net/oclhashcat-plus/

[prezjordan]

Aha, you're absolutely right. Shame "cracking hashes" is synonymous to Bitcoins in my mind.