Pintera has just been submitted. It is a fully Metro experience for Pinterest on the Windows Phone. Features include exploring Pinterest by user, board, category and search as well as a secure log in to enable liking and repinning.
Assuming all goes well it will show up in the marketplace next week.
Negative Eddy 
Can we post using pintera into pinterest? I do not find that feature working in mine.
The current version of Pintera allows you to repin existing items you find on Pinterest, but it does not provide a way to pin new items. That functionality is on the list of requests for a future version though.
Thanks for the reply @negative eddy.. thanks for providing this wonderful apps as it is and would love to have that feature as well..