I have recently discovered and fallen in love with a site called http://onetsp.com/ and I wanted to spread the word about it. You can collect all your online recipes in one spot (and even type in your own non online recipes yourself - you know, the one your Mum gave you years ago and you only have on a scrap of paper), tag them with your own tags that are meaningful to you, etc. And then they're all in one place! Now, if I have 3/4 of a bunch of cilantro left in the fridge and am wondering how to use it up, I just search under the tag cilantro and up pop a dozen choices. You can also go in and edit any existing recipes you've added with your own tweaks.
It used to be that there was a fair bit of copying and pasting involved, so to copy over a large collection was a bit of a slog, but they have recently introduced the "recipe clipper" widget, still beta... http://onetsp.com/clip/ And it's even easier now. You drag the widget to your toolbar, go to the page with the source recipe, click the widget, and bingo! One click! It's added for you, ready for you to tag.
I feel guilty about using this resource so much, because it's free and I have no idea how the person who developed it is making money off something that is so useful to me that I haven't had to pay a single dime for. So I figured the one thing I could do is spread the word and encourage others to check it out. I likely won't ever actually throw out my stack of printed off recipes, but I might shove them into a back cupboard somewhere instead of keeping them in the kitchen.
Give it a shot :)