I found BlogMap by accident, but thought it was pretty fun. So I added it to my left navigation.
If you register your blog here, the link they give you shows a map of bloggers that are in your area. It’s using MapPoint technology (the map image says “Evaluation”), and it’s a pretty interesting use of the technology. I’ve yet to decide if there is a real benefit to this, but I thought it was cool anyway. 🙂