How do you manage code snippets?

Do you keep them in your IDE, or elsewhere? Do you have an app for that? Are they easily shared?

I realized I have no system at all but could use one to make it easier to find code I've written and might need again some day.

By snippets, I am referring to any chunk of code / text in any format or language, of any length.

Thanks!

EDIT A DAY LATER: Thanks you all! Reading all these ideas, I got inspired to create my own little web app. Wish me luck... :)