Via the mailbag I discovered a tool that's pretty complimentary to the VBCommenter. The Quickdoc Viewer is an add-in module for the Microsoft Visual Studio.net IDE which offers a simple WYSIWYG XML to HTML previewer for XML based documentation comments. According to the author the main motivation for this Visual Studio.net add-in is, to be able to quickly preview XML documentation comments from inside of the IDE. But pictures speak louder than words. If you are using VS 2003 and like using XML comment documentation then this could be for you. Check out the shots to get a better idea.
More Info and Download: