I just noticed today that there's an option to sign in to multiple Google accounts. I have a personal Google account and a couple business accounts. Now, I don't have to sign off from one to use the other. There's an option to switch accounts next to your username at the top right corner. I mostly only use GMail and Google Docs. I wonder if they just launched that today, or I've just never noticed it. Anyway, it's awesome.

Facebook and Twitter should do the same. I think most people who work on the net and/or have their own business have multiple Google, Facebook, and Twitter accounts. It's a hassle to have to log in and out of each of those accounts.

UPDATE: Looks like it only works with Firefox 8. I can't seem to do the same on Chrome. If anything, you'd think it should work on Chrome, since they're both Google products.