I went looking for a plugin that would make it nicer (syntax highlighting, etc) and first came across the KaSyntaxy bot, which was ok, but I was hoping for something a little more robust.

Enter the Code Snippet gadget (wave link <- you have to have Wave access to get to it).  It’s absolutely perfect.  Very simple to insert code in many languages, syntax highlighting, and the ability to lock the code so others can’t edit it.  Here’s a little sample of what it looks like inside GWave.