It's possible than when the site does come back online, the attackers could quickly log in as some of us, change our bitcoin address to be theirs, lower our payment thresholds and steal our confirmed coins...
Or am I being paranoid...
PARANOID and with good reason...
it took me a while to re-set my bitcoin address ( was online one that I later read was untrusted PRE-DDos attacks on Slush's and had the ' fun ' of waiting for confirmation emails )
so even if they did get your password, tryed to change your bitcoin wallet id, there is still hope that neither you or the attacker can get access by logging in and setting payout to some really high number ( like over 50.0 BTC )
Worst case senario.... both you and the attacker are locked out of the earned BTC until you ( or the attacker ) can convince Slush to let the coins out of the wallet.
He did get a database snapshot so there should be enough info there to see what goes where apropriatly.
I'm not too worried about possible coin theft as I am still CPU mining and have earned ( not from Slush yet, still too slow for that kind of coin ) 1/9th the BTC for what some call an ' intro GPU miner card ' and will be workin all the free BTC sites as hard as my mining rig to get as much as fast as possible to get that kind of hash power and doubt i'll ever move from Slush's pool ( unless it gets to over 50.5% )