I made a transaction on March 13th, transferring .88 BTC from my desktop wallet to another account. I have a Mac and am using Bitcoin-Qt version v0.8.1-beta. The transaction did not go through, my wallet is "out of sync", and I do not have the .88 BTC in my wallet anymore. I have scoured the internet trying to solve this problem and have not found anything yet. Any help is MUCH appreciated!
You can see when is your transaction with : https://blockchain.info
If your wallet is out of sync don't worry, it's normal that you don't see the transaction. If you sent BTC from A to B, B will see the transaction when he's synced.
I solved my own problem. If others have this problem, the easiest solution is to find your wallet.dat file on your Mac, which is in in ~/Library/Application Support/Bitcoin/
Import this folder into a new wallet on Blockchain.info. Your balance will show up in there and you will have access to your BTC.
That was fairly simple and I spent way to much time on that!