Google Inc. has announced on one of its blogs that it is testing mutliple accounts sign-ins using a single browser. The post admits that it has big limitations for now, such as only being available for Gmail, Google Calendar, Google Reader, Google Docs, Google Sites and Google Code, but said it is likely more services and support will be added in the future.
If you use a service that doesn't support multiple sign-in, it will default to the first account that you signed in using your browser. Another limitation is that Gmail's offline mode is disabled if you turn on multiple sign-in.
Multiple sign-in will let you open Gmail in multiple tabs, log in using different accounts and read the messages from all your accounts without opening another browser. Right now, you have to log out before logging in to a different account.
Multiple sign-in will let you open Gmail in multiple tabs, log in using different accounts and read the messages from all your accounts without opening another browser. Right now, you have to log out before logging in to a different account.