I am now rushing over to my Google Account (google.com/accounts) so that I can see and use multiple Google Accounts in the same browser. It is truly annoying to have to sign in and out to share things across the web. From the Official Gmail Blog:
Simply click the link next to "Multiple sign-in. "After you sign into your first account, you can sign in with up to two additional accounts from the new accounts menu in the upper right hand corner of Gmail, then easily toggle back and forth between them. You can even open multiple Gmail tabs — one for each of your accounts."This is currently available only for desktop browsers and not all Google services support multiple account sign in yet.