Eat 3D has released the first part of their new series on UnrealScript.
With James Tan as your instructor, this tutorial starts by covering the basic structure of UnrealScript, as well as setting up your development environment. He then goes on to show you everything you need to know to recreate Assualt within UDK.
Read more about it here: http://eat3d.com/unrealscript_mc1
Thanks to Eat 3D and James Tan for putting this together.