Mac Bitcoin-qt 7.0 crashing

[BTCHashers]

My bitcoin client has been crashing recently when I was downloading the block chain. Today, I downloaded the bitcoin-qt 7.0 client and I ran it, on startup it gave me an error
"A fatal error occurred. Bitcoin can no longer continue safely and will quit.

EXCEPTION: 22DbRunRecoveryException       
DbEnv::txn_checkpoint: DB_RUNRECOVERY: Fatal error, run database recovery       
bitcoin in Runaway exception "

I went into application support/bitcoin/ and deleted all the files except for my wallet.dat, and it still gave me this error when I tried to start it, how can I fix this?

[BTCHashers]

I am running osx 10.8.2 if that matters

[Raoul Duke]

Can you try removing/renaming your wallet.dat also and see if it still crashes?
Don't forget to make a backup before removing it if you go the removal way

[Stephen Gornick]

I am running osx 10.8.2 if that matters

Well, it helps to exclude this:

If you are running 10.5, you should not upgrade yet.

Like psy suggested, if the wallet.dat is the only db left and you still get the error, then the wallet.dat is probably in a bad state. 

So to know for sure, move it aside (e.g., rename it to wallet.dat.tmp or something) and let the client re-download the blockchain and create the empty wallet. 

But that doesn't solve your problem if the wallet.dat is in a bad state.  Did you have a recent backup of it?