This stuff will actually add a "Copy as HTML" menu item to the Visual Studio IDE.  When you're in a code file like Junk.cs you just hightlight the code you want to copy and right click.  Select "Copy as HTML" and then paste to a blog or whatever.

http://www.jtleigh.com/people/colin/software/CopySourceAsHtml/

Also comes with the source, for those of you like me wouldn't mind expanding VS's IDE to suit your own tastes.