You can now use code in comments, thanks to the new version of iG:Syntax Hiliter. If you want to hilite the code in your comment, surround it with special tags. The special tags are [ vb ] and [ / vb ]. If you exclude the spaces, and you should, it reads: open bracket, vb, close bracket and open bracket, backslash, vb, close bracket.
If, in your code, you have any blank lines, the font will change and it will look silly. I recommend that you put a single space in any blank line so that the formatting doesn’t change. I’ve asked the author of the plug-in why it does this and he says it’s because of my css. I wrote my css, but I still don’t know enough about it to be able to figure out why this misbehaves. If you’re a css expert and want to help me, let me know.
Enjoy your new found abilities. Feel free to experiment like crazy in a comment to this post.