If there's a Gmail equivalent of adding a zillion toolbars to your browser, then I'm the poster boy. I've added so many lab features and gadgets that my Gmail functions rather... differently. But I'm all about simplifying, and the Firefox add-on Integrated Gmail does just that while also giving you a window into more Google services in a top-down view. The pic above shows you "minimalist" mode and is an incredibly slimmed-down version of Gmail, Reader and Calendar. Integrated Gmail also supports custom URLs and Gadgets like Remember the Milk, so you're not just stuck with Google stuff like Picasa, Notebook, etc.

Be aware that this does a lot of fancy Javascript work to make things happen, so a few Labs features will cause conflicts. I had enabled the ability to move nav columns around, which it didn't like. Also, even in settings you'll see Reader, Calendar, etc. So if you're not keen on seeing this in every single screen, you're kinda stuck with it.

That said, if you live in Gmail and you need a simplified dashboard, this is a nice little add-on to Firefox. The developer is asking for $5 donations, which is pretty reasonable for keeping your mind uncluttered.