I know lots of Integrated Development Environments (IDEs) allow you to store regularly used snippets, but a complete IDE might be overkill for just storing snippets.
If you're on Windows, I recommend something like Texter - good program for storing snippets that are hot-key accessible, and also the text-editor
Intype for intergrating your snippets with you development work. I sing Intype's praises quite a lot, but it's a program drawn back by it's slow-arse developers; I think we waited over a year for a new alpha release. Anyway, it's a lovely, efficient editor that I use if I'm on Windows.
*nix, some people swear by Nano, Vim, etc., but not me; ergh; I'm a
pointy-clicky kind of guy - blame it on my youth.
Also, I second the use of Git - great little tool. You're able to use it even with SVN repositories, which is pretty awesome. Have a look at
google's code hosting project - v. good stuff. It's SVN only, I believe, but, like I said, Git is usable with SVN.
Mark.