It was nice to see that several weeks ago Google Mail, mobile version, brought in multiple-accounts sign-in, which really simplified monitoring several accounts.
If you are not aware of this, sign into one email account, then click on that account name at the bottom left on the PB screen and select 'Sign into another account'. You will now be able to switch among several accounts quite effortlessly! Thanks, Google! (Now could you address the matter of attachments for mobiles/tablets?!)