There are probably many people out there that have multiple google accounts and it’s a pain to constantly log into each one. I know I was having this problem until I stumbled upon a forum thread about others having this problem. Didn’t think there was a solution until I read on and they were discussing CookieSwap, a Firefox plugin.
You can set up separate accounts and go between them seamlessly. For example I created one for my personal and one for business. Then when I manage twitter, facebook, or other accounts, for clients I can set up one for each. This makes life so much easier!
This plugin is no long available, please post here if you found something similar.