Thanks to a initiative by Nathan Grennan we now have support for SSE2 in svn-revision r112. Get the latest code from trunk and enjoy a ~3x performance increase on recent CPUs. The SSE2-code was originally written by Alvaro Salmador.
In other news: Pyrit no longer uses psyco as it causes problems with SSE2 and Padlock and the project seems to be dead. Goodbye and thanks for all the fish.