Btw, we're back up to the $500 range for Btc.
i shutdown my 30Ghash butterfly miner about a month ago.
once the network total went over 40,000Thash/s, there was no real point as it would mine about 0.0810 btc/mon on average.
if you’re wondering about the math:
(your rate / network rate) * 108,000 btc/mon
in my case:
(30 Ghash/40,000,000 Ghash) * 108,000 btc/mon == 0.0810 btc/mon