Epic has released 171 free video training tutorials spanning 17 topics for Unreal Development Kit users:
http://udn.epicgames.com/
We’ve also updated the UDK Licensing FAQ to cover a lot of common inquiries.
http://udk.com/licensing-faqs.
And, of course, we’re constantly adding new UDK content to the Unreal Developer Network (UDN).
http://udn.epicgames.com/