I have a shortcut to it on my phone. Do a search for blackberry web shortcuts and you should find what you are looking for. I just got the shortcut last night and it works fine.
Posted from my CrackBerry at wapforums.crackberry.com
...or, you can use blueapple.mobi web video search to convert from YouTube to BlackBerry format. The resulting file can be saved or played back in full screen size.