The Certicom ECCp-109 challenge,first posed in 1997, was solved by the Notre Dam team using a network of 10,000 computers (mostly PCs) running 24 hours a day for 549 days. $8,000 of their $10,000 prize money was donated to the Free Software Foundation.
That is a shit load of computing power. I wonder how is compares to a sun E15K