You'll likely hear a lot about Pinterest in 2012, as people look around for "the next big thing" in social networks and online sharing. Based in Palo Alto, CA, users can pin things (pictures, links, notes) to various virtual pinboards they create, which can be shared and commented on by other users. Now you can join in with a Windows Phone client called Pinspiration.

From the app description:

Pinspiration is the best way to browse and post to Pinterest on your Windows phone. Think of Pinterest as a virtual pinboard — a place to catalog and share the things you love. People use pinboards to plan their weddings, decorate their homes, and organize their favorite recipes. Pin anything that catches your eye: memorable meals, places to visit, or great shopping finds!

The free version of the application is ad supported, and I like that you don't have to be a member of Pinterest to join in - you can explore the network, leave comments on pinned things, and discover virtual pinboards without signing up.