Right now the 3D Buzz site in co-operation with Epic games has a series of tutorials on mapping, modeling, and coding for the Unreal engine as an assist for the upcomming "Make Something Unreal" contest.
They provide - free - Video Tutorials on how to do the basics of UED, and gradually advance to more rigerous courses. Anyone whos ever thought about mapping, modeling, or coding should definatly check this out.
3D Buzz also provides other courses in 3D Studio Max, Maya, Lightwave and other programs explaining basics and teaching step by step how to use them.