The release of a good public GPU miner is one of the contest goals. Another is to close the huge gap between the reference CPU solver, which achieves 0.06 solutions per second, and private CPU solvers, which achieve 2 solutions per second (all single-threaded an a high end Intel Core i7).
http://toom.im/ has the fastest known GPU miner, while
https://cloud.zeropond.com/ was the first to offer cloud hashing (unavailable to US customers).
The release of a good public GPU miner is one of the contest goals. Another is to close the huge gap between the reference CPU solver, which achieves 0.06 solutions per second, and private CPU solvers, which achieve 2 solutions per second (all single-threaded an a high end Intel Core i7).