Ask HN: How do you organize your code snippets?

From time to time, I write some small useful code snippets, which aren't big enough or worth the effort to save as a library. Most of the time I end up forgeting where I saved the file, and have to rewrite it again a few months later.

What do you hackers do for your snippets? Is there any free (or cheap) online webapp for this with a good interface?

If not, does anyone else feel this problem? If someone is willing to help me with the front-end, I am happy to code up the backend and we could set up such a website.