Based on a previous post of mine, I started hunting for a source code repository to use. I found several. The one I liked the best was snipplr.com. There were a few reasons I liked this service. It has a very simple, clean interface. It has a simple, open API for accessing your snippets from other applications. It keeps track of snippet changes. It handles colorizing source code. It provides tagging of my snippets. I've also had no problems reaching it and it seems snappy.
As an experiment, I've added a snippet sidebar to my source code editor, Parachute, which can be downloaded from my website. Just open the options and enter your snipplr API key. Your snippets should show up and can be filtered by the tag bar at the top. Double-click on a snippet to paste it in the editor pane. Please try it out and let me know how you like it.