MetroTube,YouTube client has been updated to version 3.3 . This update adds the function "whatch later" and fixed some bugs as you can read in the short changelog below.
MetroTube v3.3 changelog :
Added 'Watch Later' support where users can access & add videos to Watch Their Later list.
Fixed nasty bug where videos Occasionally would get stuck on loading screen
Various minor bug fixes and optimizations
The application is very complete and easy to use.Through its convenient interface you can search, browse the various categories in Youtube, comment, vote, share videos, but also view related and manage subscriptions, favorites and playlists.
MetroTube is a free download from the Marketplace by clicking the link or use Bing Vision focusing on the QR Code