Class Modules are powerfull constructs that allow you to simplify and optimize your code.
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Both the below books by John Walkenbach are fantastic books and he is a brilliant author, I would recommend picking one of these books up even if just for a reference. I have read power programming cover to cover and it is easy to follow and is a must have for any serious VBA programmer.
If you have read any books and feel they are worth recommending then please post about them on our Forum.