I ran out of space while synchronizing, how do I get my private keys & find my balance?
If you know what bitcoin address your bitcoins are coming to (and you should know if you expect to get your bitcoins), you can lookup balance on blockchain.info like this:

http://blockchain.info/address/your-address

replace your-address with your actual bitcoin address, for example here some random address i found: 

http://blockchain.info/address/1LNx3azmdKyH43UsJ6DK9oUrTbkPUr6UJg