Help: How Do You Organize Your Recipes?

Nearly every day I read a recipe I want to try (at a minimum -- often, I drool over multiple recipes) on the Internet. I know you do too! I know it! What I don't know, however, is what you do with those recipes. Personally, I think "Oh yum! I should make that for (dinner, x's birthday, breakfast with y)! It's perfect!" And then I move along, and before the day's out, I've probably forgotten it. Sorry about that, x and y, I'm sure it would've been delicious.

So what do you do with the recipes you find online and love? I'd rather have a system that doesn't involve printing them out, as I try to do that only for the most elaborate recipes, or ones I'm not cooking at home. I'm sure there's got to be some fantastic app or aggregator that everyone but me knows about, so please share. At this point I've got some halfhearted bookmarks, half of which are on my work computer where they're pretty useless, and an exploding recipe box jammed with printouts. There's got to be a better way.