I apologise for the complete lack of updates in the last who-knows-how-long. I thought I had better announce that the blog, at least, is dormant, and will be replaced by a complete redesign sometime soon, probably over the summer. It may be ASP.NET, it may not. Depends how I feel.
Anyway, the main point of this post is that there is a new Default Layout Guides add-in available in the Add-ins area

EDIT: The link now works

2006 Edit: The link now works. Again.