Account switcher
In drop-down menu, allow user to switch accounts and select from all saved accounts.
Save all usernames for quick access. Save passwords for as long as possible in sessions, but if they need to re-enter their password, periodically, that is ok. Very ideal to keep passwords saved so people can pop between accounts at a moment's notice.
Consider showing potential quick-logins in the top, middle of the page, where you can click on any of your avatars and instantly log into that channel and go to the channel page. Up to 6 (or whatever will fit) of your most recently switched-to channels.
Edited by Bill Ottman