Well, the answer is sort of a yes and no thing. The "yes" part is that I have and love
Gmail Unread Count, because I like it better than the notification bar. It creates a widget that shows you how many unread items are in an account, and you can label them whatever you want-- so, for whatever account it reads.
The "no" part is that if you select any of the icons, they all take you to whatever gmail screen you were looking at last, no matter what account it is. I have two, one for my personal account and one for an account that picks up my work email. If the last gmail screen I was looking at was an email in my personal account, and I just hit the home button to get out of it, then when I hit either of my unread widgets, they'll both take me back to that email. I still have to navigate back to the inbox, hit menu, accounts, and go to the other account.
This is a pain, however, the app gets updated frequently and the last time I annoyed the developer about something I was told that an update correcting this would come down the line.