Yeah, I like that one. I also like Canon Lenses, which is free. Canon Lens Buddy ($1.99) is very similar to Canon Lenses, but it lets you add lenses to your Own It list (and add serial #s) and Wish List. Oh, and it doesn't have adds. I think it's worth 1.99.
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"You miss 100% of the shots you don't take" - Wayne Gretzky