[bhrgunatha]

http://www.youtube.com/my_account_unlink I unlinked mine a long time ago - so I'm not sure if this still works.

[Wilya]

Just tried it, and you can indeed unlink the accounts. But you can't login with just a youtube account. You need a Google account.

Still useful to relink to a throwaway account instead of the main gmail account. But I'm not sure the multiple account will let you stay logged in correctly..

[pestaa]

I'm logged in to 3 different Google accounts all the time.