Klout Score is an unofficial Klout client for Windows Phone developed by Microsoft MVP Julien Dollon. It allows you to track your klout score, etc,. The app looks well designed and performs well.
-Connect with your klout username
-See and Share your klout score with 2 theme (black/light)
-Auto update your klout score in the tile each day
-See your favorite topics and ask for +K
-See influencers and influencees
This free app will be available for download from Windows Phone Marketplace from next week.
More details on Klout score here.