If you haven’t download the UDK yet or want to read their updates and news.
Check out their forum for user questions and answers.
The Unreal Developer Network documents nearly ever parameter in the Unreal Engine in detail.
This archive stores hundreds of tutorials especially for the UDK
Great videos for beginners and advanced users.
Also useful videos made by the famous Raven67854.
Text and video tutorials with focus on custom assets and UnrealScript programming.