I posted this back in the beginning of September, but the idea is evolving, so I thought I'd post it again. I keep track of all of my thoughts on class development using MindMaple. It's a free mind mapping program that is a regular part of my online life. There are plenty of others that would work, Richard Byrne just posted a list of ten good ones on his blog "Free Technology for Teachers.
Here's my current mind map. I expanded one of the sub topics, anything with a "+" next to it has more contained within. You can attached links, notes, whatever. I'm a big fan.