you're in luck...tom1 has just come out with an excellent battery meter/ROM memory meter/program and storage memory meter/cf or sd card meter/backup battery meter with actual battery percentages and estimated time left. it's very configurable (you can turn and off anything) and adjust how it calculates power. check out this thread. but make sure you read the whole thread before you download - there's updates.
backgrounds are transparent too. i use it with dashboard and it works well.