If you want a quick and easy way to find out what exactly is new in Java 7, take a look at this short series of videos.

There isn't a great deal to add to these videos except that they are difficult to find as a set. They are all courtesy of Oracle via the offical Java You Tube channel:

Part One - Project Coin

Part Two - NIO

Part Three - Concurrency

Part Four - GUI (It claims to be part three)

It isn't clear if they will be a fifth part, but if there is it will be added to this list.