Now, you can visit "https://www.google.com/accounts/ManageAccount" and 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.
On Next Page:-Click
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--> Save The Settings...
Now U can Sign In Ur Another account By The New Advanced Feature Added to your google account page..like..
Please keep in mind that this is a feature for advanced users, and there are a couple things to watch out for:
1) Not all Google services support multiple account sign-in yet. For the services that don't support it (like Blogger and Picasa Web Albums), you'll be defaulted to the first account you signed in with during that browser session. So if you click a link from Gmail to Blogger, for example, you'll be logged into Blogger with the first account you signed in with, even if you clicked the link to Blogger from your second Gmail account.
