It would be really (really) useful to be able to link multiple logins to a Channel9 account. For example, I don't think I'm the only one who has two separate Microsoft Accounts - one personal account & one for work. That means I'm often logged into whichever one I don't happen to have a Channel9 account with - and it's oh-so-frustrating to have to start a private browsing session, log out of whatever I appear to still be logged in to, log in, etc. just to comment - and then have to do it all again a few hours/days later.
So, if you could implement multiple logins being tied to the same C9 account, I for one would be a very grateful Niner. :)