So I guess for now we throw torify in front of the miner and if this takes off wait for (or help with) patching miners to try and proxy .onion domains? Or maybe I should say, adding a new user, turning off LP and doing torify python phoenix.py ... Just Works. And cgminer uses curl which supports SOCKS (and of course see the Tor FAQ about SOCKS and potential privacy issues) so it should Just Work too, but I haven't fiddled with that yet.
Yes, both torify or SOCKS5 proxy in miners should work. Actually it would be really amazing if somebody write short howto for running miners over Tor (maybe to bitcoin.it wiki?). Unfortunately torify works only in Linux, so Windows users need miner with SOCKS5 support.