As Justin announces here, my team recently released the picture services sample.  This is a cool way to expose the pictures on a machine that are found via Windows Desktop Search out in a simple, easy to consume REST endpoint.

There are a few things here that I think are pretty cool

• Pretty easily return POX and Syndication formatted data, and creating a URI hierarchy (here)
• Querying Windows Desktop Search (here)
• Adding Simple List Extensions (here)

Justin has a screencast here.