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As a reminder, EOS 10D/D60/D30/Digital Rebel owners should be aware that any damage caused by use of a generic battery pack will void the camera's warranty.
http://www.powershot.com/powershot2/...er/libatt.html
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Chuck's warning is something that should be considered carefully.
If you do use a third party battery, I recommend that you stick with name branded alternatives from a recognized source with a manufacturer's warranty that should the battery damage any device in which it's used, the battery manufacturer will ante up for the repairs. In other words, ordering from somebody's garage on E-bay is pretty risky. Wal-Mart sells generics for $25.72. Not sure about the warranty on them but at least Wal-Mart is a recognized seller with deep pockets if you need to deal with legal issues.