This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
A significant part of Java 7 is the extensive support for file/directory operations. The directory traversal techniques (SimpleFileVistor) and the support for WatchEvents are nice. One area where this could be further expanded upon in Java 8 could be in GUI support for these type classes. Either better integration between these classes and the GUI components or new components could be developed that directly support these features would be nice. It would simplify application development and augment the GUI interface.