I've just installed MapVisitors on my blog, you can see a button on the left column here to show the map. Don't know yet how efficient is it, I installed ClustrMaps also to compare maps.
Anyway give it a try, it's free and it nicely uses Microsoft Virtual Earth API and pushpins.
As it is Virtual Earth you can navigate on the map, zoom and switch to aerial or hybrid views. Also the guys at MapVisitors are still working on it and plan to add new features like geographic grouping and use differently colored pushpins.
Usually I set Google Analytics for stats but no way to make it work on this Community Server blog... If you have a solution, thanks to share!