Hey guys here's a tutorial that i wrote about Light Mapping in the Unreal Development Kit. I used the April Beta but most UDK versions should be fine.
Tutorial comes with all the assets needed to complete the tutorial as well as the starting and ending file and a PDF version so you can keep it for your own use. Its also written in a step by step manner so it should be easy to follow.
Let me know what you think and if it was helpful. All comments are very appreciated