i never keep track of my ideas. i only have a few that really stand out and those i never forget. if your ideas don't come back to you over and over again, then those aren't good ideas. also, i try to be proactive about finding out whether they're good ideas by talking to people - anyone - old bosses, old friends, new friends, guys who hit on me at coffee shop, etc.

Why do ideas have to be private? if you have an idea, you can be sure that you are probably not the only one who came up with them, so feel free to discuss openly.

there's nothing worse than being paranoid about keeping your ideas to yourself.