Dashboards and Reports Books

This isn't an excel function specific thread. This is a book and / or website review request.

I keep reading all these websites and books claiming to teach you how to make these excel Dashboards and Reports. Each one claims to the greatest thing since sliced bread.

I need to be able generate usable, functional, and easy to reproduce reports at work. Therefore, all the descriptions of the books and websites sound great. However, I don't want to waste my time or money. Are any of these books and / or websites worth it? Can anyone give me some honest reviews if you read any of these books?