+1 to all the Viva Pinata stuff - definitely bought the guide. Sounds silly and meant for kids (which, of course, it IS); however, it's very addicting, and one of those games that makes you want to check off everything in the garden log book. A task that gets extrememly complicated, especially with all the farking Flutterscotches.
Also bought the guide to the first Little Big Planet game -- turned out to be not nearly as useful as the internet.