easyTube is a slick YouTube app for Windows Phone. It’s got some nice features like playing 720P videos, remotely loading videos on a PC from the phone, the ability to play only the audio stream from videos, and downloading videos to the phone so that they can be viewed later without an internet connection. Plus you can play your YouTube Favorites continuously without having to select the next video, which I love.
easyTube was originally available in a free ad-supported version only but a paid ad-free version came out in August. Right now they are both free, enabling everyone to get the proper adless version at no cost. This promotion lasts until the end of September - plenty of time to give it a download.
You can get the new ad-free version of easyTube here (Zune link) on the Marketplace.
Thanks to Timmy Bouwmann for the tip!