This plugin helps you create a simple travel map to display on your blog. The map is using the Google Geocharts API. Markers are placed on all locations found in your posts (inside a custom field of your choice). Clicking a marker links to the post associated with that specific location. Hovering over a marker opens a popup with the title and a thumbnail (if the post at that location has one).
I built the plugin to create a map of the places I have visited and you can see it in action on my personal site.
Limitations: As the name says this is a simple plugin I built mostly to solve a problem for myself. It does exactly what it says above but, at least for now, not much more. There is no support for other map types and locations can only be added based on a custom field in your posts.
Please have a look at this post for more information as well as details on how to install and use my simple travel map plugin. In the post I have also written about some good alternatives to this plugin for slightly different purposes.