You can attempt recovery with the experimental build linked here by "PullTester" (Windows), it will keep on recovering when previous salvage attempts would fail:
https://github.com/bitcoin/bitcoin/pull/2410Backup your wallet before and after. Try to recover old backups of your wallet.
The link to the binary there is now dead. Still lost trying to recover this wallet... it's just downright insane that Bitcoin doesn't use a standard, human-readable file format for the all-important wallet.dat file. >.<