Just a quick read of this post showed me several great gems that I want to try right away! If you're a Rails programmer this is going to be of great interest: Rails 3: Fully Loaded
ActiveAdmin is particular looks like an excellent new way to generate a whole suite of reasonable views and controllers to create, read, update and delete information in Rails3 applications. ActiveAdmin is customized with a DSL so that you have a prayer of getting what you want without hacking the hell out of the logic that is built in. I will definitely try it.