I just thought I would toss this out there. One thing you can do that would make it a little better is to use another browser when you check one of the accounts.
For example: If you have one account you check in Firefox and the other account you check with Safari or Opera or even IE. At least that way you don’t have to sign out and log back in when you switch accounts. You just need to open the other browser.
It is just a thought.
Edit :: This is even better if you use Firefox. This extension allows you to swap cookies so it is easier to switch between accounts.