Google has added multiple account sign in to their mobile Gmail site. This feature has been available on the desktop for over a year now, and is helpful for users with more than one Gmail address. For ease of use, users can set separate bookmarks for each for instant access to individual accounts. On iOS devices, Mail.app supports a unified inbox, but some users prefer using the web interface. Google has also introduced a mobile-specific signature so contacts know when you are emailing via a handheld, and the ability to set a vacation auto-response.
Just like on your desktop, you can now to sign into multiple accounts simultaneously. To sign into an additional account, click on the account switcher at the bottom of the threadlist, then click ”Sign into an another account.” You can quickly switch between accounts by selecting the desired account from the Accounts menu.