Coinlenders;
What happened with previous big(ger) thefts ?
Inform all exchanges AND mining pools not to process certain addresses ?
BTC are lost, but the thieves can't use them either.
https://bitcointalk.org/index.php?topic=83794.0And no the stolen coins cannot be recovered or blocked, although the addresses are now "tainted" so spending/selling those coins will be a bit dangerous, assuming the people accepting them actually care.