Good plugin. Support is great too.

The WP Google Maps plugin is great. It has a small issue about not showing the right marker when it is tagged in a variety of categories. But it is a small issue. The most handy feature and also what makes life easier regarding that small issue, is the ability to download and upload marker CSV files, and able to replace rather than just add markers. So duplicating markers and tagging each of them in different categories are so much easier. This is a good plugin nontheless.