UMapper is a custom map creation tool that allows you to create maps from just about any JPG, PNG, or GIF file. Using UMapper is a simple process of uploading an image and selecting a map service (Google, Yahoo, Bing) as the basis for the map. The finished maps can be embedded into your blog or website. I gave it a try earlier this evening and it worked although it was a little bit buggy. (To be fair UMapper is still in beta). A video overview of UMapper is embedded below.

UMapper also offers a platform for creating your own geography game. UMapper GeoDart is a simple game in which players have to locate the places the you specify. The directions for creating your own GeoDart game are contained in the video below.

Applications for Education
UMapper GeoDart could be a good way for your students to create a geography game for learning to locate countries, states, and capitals.

Here are some related items that may be of interest to you:
A Visual Guide to Global Trends
MapTrot – Easily Create and Share Maps
Quikmaps – Quickly Customize a Google Map