Finding low and high md5/sha512 hashes with OpenCL and Python

Currently the leader of The Famous Hash Game(for MD5) and hash|challenge, with my HD7970, IPython notebook, and PyOpenCL, atitweak, and kernels modified from oclcrack and John the Ripper.
Source code can be found at http://nbviewer.ipython.org/github/tjwei/tjw_ipynb/blob/master/lowest%20md5.ipynb
and http://nbviewer.ipython.org/github/tjwei/tjw_ipynb/blob/master/lowest%20sha512.ipynb
The hash rate on my HD7970 GE is about 6.8 ghash/s for md5 and 175 mhash/s for sha512