When buying and selling bitcoins it can be hard to keep track of your trading profits. Especially when you are using multiple currencies and withdraw money from time to time. Let MtGox-Viz do the work.
MtGox-Viz gets the data directly from MtGox without any manual steps. And when you come back tomorrow, the data will still be up to date.
Did you really turn a profit by buying 2 BTC and selling 0.7 BTC a day later? By converting all you assets into USD with the corrsponding days exchange rates, you can compare everything easily.
This has just been released into the wild, so if there's a problem, just drop me a line.