What do you really need a youtube account for anyway?
sharing videos is easier, cos you dont have to send the link around to all ur friends, just check the boxes of your contacts and send once.
There are some videos which you cannot see otherwise.
You can comment on your friends' videos and just post some funny stuff up, say if i made a video where i jumped onto a windshield of a car and cut my face like woody then i could post it up. i think he already did that.
You can save videos in a playlist and as favourites.
I can download stuff and put it on my phone, excellent quality when on phone sized screen.