pypy doesn't support gevent/eventlet, as far as I know. :(
Not yet, indeed. But according to their site they do have a stackless version: "PyPy can be configured to run in stackless mode, providing micro-threads for massive concurrency". This sounds promising, and could be used to implement gevent.
Unfortunately, psyco isn't x86_64 compatible either. So if you want to use psyco, you are "stuck" with python2.6 on x86.