I can second this. When I learn about new topics I like to blog about them (betterexplained.com) to help cement what I've learned, and have a way to relearn (in

I can second this. When I learn about new topics I like to blog about them (betterexplained.com) to help cement what I've learned, and have a way to relearn (in my own words) a topic once I've inevitably forgotten. I think you'll find this rewarding for yourself and others.