Pastebin: Share Source Code Snippets Online
Pastebin is an online collaborative debugging tool. It lets you store snippets of code for a day, a month, or forever. The snippets are syntax color coded. Each snippet is given a short URL so you can easily share it via IM, email, or post online. Someone may post a modification to your code snippet. You can view the modifications and see a diff of the changes.
Pastebin is free to use.