SuperTube HD | watch and download HD videos from youtube on WP7
http://www.1800pocketpc.com/2011/03/29/supertube-watch-and-download-hd-videos-from-youtube-on-wp7.html
SuperTube is a powerful YouTube app for Windows Phone 7.
With Super Tube, you can:
1. Browse High Definition (720P, 360P) and standard videos from YouTube
2. Download all videos of the YouTube to phone's local disk, and supports resume broken downloads
3. Search all videos by relevance, published date, view count, and rating
4. Support Multi-Language (English, German, French, Spanish, Japanese, Italian, Simplified Chinese, and Traditional Chinese) and Multi-region function
All users of trial and full version can browse the High Definition and standard videos for free.
Trial version contains advertisement, and limits users to download 3 videos successfully. Full version removes all advertisements, and allows users to download all videos without limit.