D3-planner
Plan your Diablo 3 character with this web app
I have notes spread out on skills, passives, specific gear pieces, general tips, and I wish there was a way to collect and connect them all together in one place. I might still have to keep a notebook of general wordy tips around, but Diablo III MVP Monstrous found a solution to my gear and skills set problem -- it's simply called D3 Planner.