Jeffrey Palermo has assembled a great list of productivity features inherent in JetBrain's ReSharper (R#) that make it one of my all-time favorite tools.  I have a hard time remembering the myriad of keyboard shortcuts, but he mentions several that I use on a daily basis that make programming a joy.

It's a great reference for users of the tool and a great list of enticements for those not using it that want a boost to their programming environment.