greasemonkey

Google Docs & Spreadsheets is a great service for collaboration. With the quite recent introduction of Revision History in spreadsheets, it became even better. However, there is one thing that really annoys me - when working on a spreadsheet with several sheets and you want to see what your collaborators have changed, you can't see which sheets were edited but have to manually step through each sheet and look for edits. It takes time, a lot of time...