I'm playing with SOCKS5 support for poclbm, looks like very simple patch, unfortunately with external dependency to socksipy library. If it will work, I'll ask m0mchil to accept it to upstream. Worse thing is that poclbm is pretty sensitive to timeouts (default is 5sec, which sometimes isn't enough for Tor).
What's poclbm using for url parsing? I was poking phoenix earlier (and hoping to have time today, but didn't end up with) to try and add a proxy option since there's examples for twisted (which phoenix uses) and urllib (which I hope others use, heh) for proxy.