We can all agree that the default YouTube app in Windows Phone 7 is one of its weakest links, with its paltry capabilities to just link you to the mobile version of the website. HTC noticed that and created its own YouTube client for its WP7 devices, that offers everything you would expect from a modern app for searching and watching clips from the most popular video website on this planet.
The entrepreneurial spirit of an XDA-Devs member Tom Haunsell couldn't stand the injustice, and he tweaked the code of the HTC app to make it possible for installation on other, non-HTC WP7 phones. The link to the modified app is provided in his Twitter update in the source link.
You will need to first unlock your Windows Phone 7 handset with the ChevronWP7 utility that allows you to install custom ringtones and the like, as listed in the source link, and then download the HTC YouTube app.
Have a look at what the HTC YouTube app looks like, starting at 3:49 in our HTC 7 Pro video review.
source: TomHaunsell & RedmondPie