I do a more GTD style than the previous suggestions, focusing on reducing mental clutter. Every week I carry around a todo list with the top priority projects.

I do a more GTD style than the previous suggestions, focusing on reducing mental clutter. Every week I carry around a todo list with the top priority projects. When I think of something, I jot it down on the back of the todo list. I'll review it as "input" along with all the other input from the day. Good ideas make it to my igoogle sticky note, which has become a pretty long list of potential projects. If any idea seems like a worthwhile project, then I analyze it side by side on a spreadsheet against other projects to look at a rough ROI and how it matches with my short term goals, interests, skills, and other projects. This way, I don't lose any input, can focus on the task(s) at hand, and have some degree of certainty that I'm working on better projects.