http://udn.epicgames.com/pub/Powered/UnrealEngine2Runtime/
From the forum link:
"In a nutshell, this Runtime is a basic version of the Unreal Engine (a compiled version of the code that's available to Unreal Engine licensees) that can be used to create any free non-commercial project. The Runtime comes with all the usual Unreal tools, UnrealEd for mappers, UCC for coders and a basic interface for configuration and launching the test map that comes with it."
This sounds like it would be awesome for aspiring programmers and artists working on non-commercial game projects.
Hey, thats really handy! Especially if you want to create something that has little or nothing to do with UT2K3 etc.. No extra useless code, and no need to own a copy either!