If you're interested in coin control, and you're comfortable with python and the command-line, then I could use your help.
I've written a little utility called 'spendfrom.py' that uses the raw transactions JSON-RPC api to send coins received on particular addresses that I'd like to ship in the contrib/ directory.
But since it touches the wallet it needs thorough testing.
I've written a test plan; who is willing to run through the test plan with their -testnet wallet and then try to break it?
Test plan:
https://github.com/gavinandresen/QA/blob/master/SpendFrom.md
Code:
https://github.com/gavinandresen/bitcoin-git/tree/spendfrom/contrib/spendfrom