Meh, I had about 13.37036 in Heaven Sent Gaming's account there. And 8.5731 in my personal account there. Those coins were mined late last year to early this year. I usually try to have top tier mining equipment, so this is a small fraction of Bitcoin I've had.
According to the corrupted database I had BTC150+, lol I'm rich! Just kidding, this is why I keep a physical ledger of all my Bitcoin transactions. All other users should do the same, or try to maintain a personal record outside of your wallet. Also, backup your wallet in a safe place, not just the default spot on your system drive lol. (external hdd bitcoin wallet ftw!)
I used to mine at 50BTC, deepbit, and slush's pool. Then, in February, I switched to BitMinter. As a long time supporter of Bitcoin I can tell you that I've seen quite a few fallen Bitcoin pools and sites. This one probably won't be one of 'em.
50BTC is a great pool! And I'm sure they'll correct this, and payout the majority of lost funds to people. If they do, I can guarantee you the majority of people will switch over to using their services.