Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.
Last month Gmail Team announced a new GMail Lab feature called Multiple Inboxes. I really thought its about having Multiple Inboxes. Its not so. It wont allow you to see multiple Inboxes at the sametime. Its just a Multi-view or Multi-pane view of messages in some order or pattern. ie., You can create a view and define that to display all the mails labeled something, or from some account etc.
I have five accounts in Gmail (my old Gmail Id, other 3 ids for three different reasons created in the Google Apps - Kiruthik.com account). All the four are forwarded to the id mail-at-kiruthik.com. So mails from those account would reach this mail@kiruthik inbox.
Best example is, I have a mail Id created for all the Bank & Money related messages, and I want to maintain it in a different Inbox. So I have created a mailbox fin.at.kiruthik.com This id is the one I have registered with all the banks for email communication. And, I have set an Archive & Mail Forward from fin@kiruthik to mail@kiruthik
Preferred to have other mails in a different area or pane, as the number of mails we get increases. But we dont have anyother option(Label ing it and checking those is not an option for a lazy guy like me).
Now this Multiple Inboxes for Gmail lets you to create a view and tell the source of the message to be some label, or a condition used in Gmail Search.
ie., Label:moss or TO:some-email@domain.com or subject: <somevalue>