you can also use m.youtube.com 
I cant sign into my youtube account from my new blackberry curve 8530. If I go on my home computer and sign in it works perfectly fine. Is there something different you have to do from the blackberry?
I looked up alot using the search on this forum and found a way to get into certain sites is to browse while using FIREFOX. I did that so I could sign into my youtube account. But I found I couldn't watch certain videos because I didn't have the right flash player. While still on the site I went and put my BB browser back on. Now I can still stay signed in my account and watch the same videos I couldn't before that require the flash player.
you can also use m.youtube.com
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