G10 is a gateway drug to SLRs. hahaha I wish I had snagged one when CC was closing. A pocket-size (relatively) camera would be nice now and then.
Buy the book
Understanding Exposure. Now that you have the camera, it will be the best $17-20 you can spend to help you get the most out of the G10, especially since the G10 has an amazing amount of manual control.