I made this to auto get mt.gox exchange rate and the current bitcoin difficulty automatically. You put your favourite pool's hash rate and your own personal total hash rate and it will tell you how many bitcoins you could expect to make in 1 day and in 28 days. It also shows you the currency values of the two. Additionally it tells you the typical time taken to complete 1 block using that pool.
First release public release is V 1.9
Please try this out and see if you find it useful. Please report any bugs or issues. If you like it, please consider donating.