I don't have space on my drive. It's all been used up with important data. I can't free anymore.
First backup your wallet.dat file. Then try either of these approaches:
1. Import your wallet.dat file in a new blockchain.info wallet. Then you can spend the coins.
https://blockchain.info/wallet/import-wallet2. Safer method. Delete all the blockchain files in your bitcoin data directory to free up space. DON'T delete the wallet.dat file. Use pywallet to extract all the private keys and import them into a new electrum wallet. Spend your coins as you see fit.
pywallet:
https://bitcointalk.org/index.php?topic=34028.0