Can attach multiple accounts to one username

[Kiljaedon]

I was in the process of sending a new RAF account to my main accounts to work up a new RAF team and to my horror without even realizing it i was making new accounts under my user name. I was afraid I wasted several of my cd keys on my main account when I went to the battlenet account page and it showed multiple new accounts stacked under my battlenet account. When I logged on wow it popped up choices for wow1-4 for my new accounts so if anyone does not know this you can easily attach all your accounts under one name now.

[MiRai]

You can have up to 8 accounts on your Battle.net account. They can all be logged in at the same time. These can be separated, if you so choose, by contacting Blizzard support via the phone.
If you're going to attach them all to the same account you'll need 1 authenticator code per login. If they were separate you could use 1 authenticator code for as many accounts at the same time [assuming you even have an authenticator].

[Ualaa]

If you leave them all attached to the same B.Net, you get:
- easier account management, since you can switch from one account to another without logging in/out.
- a single B.Net email can be used.
- you can transfer toons between accounts on the same B.Net almost immediately.
- there are rumors of Account Bound becoming B.Net bound at some point, while this is unsubstantiated it could rock.

If you separate them into one B.Net per one WoW account:
- You have multiple usernames, which is slightly more secure vs a brute force attack should someone learn your email address used. (Not a help against being keylogged).
- You can simultaneously log in one wow account per B.Net with a single Authenticator code. This means, password + authenticator and in...... as opposed to (all on one B.Net) password + authenticator + 30 second wait, then repeat the process for account 2.. password + authenticator + another 30 second wait... (A minimum of 2.5 minutes to connect, initially and each time you disconnect).