I am, kinda, well-organised developer and try not to code similar things twice and keep my code snippets within folders to reach them whenever needed.

Today I saw Snippely, a code snippet manager built with Adobe AIR by the Mootools development team (yeah, complicated).

Code Snippet Manager

With a very simple interface Snippely organizes your code snippets and can highlight coding syntax for easier reading. Best of all it is open source, which Adobe AIR developers looking for a good Mootools sample may find handy to dive into the code.