Ansel: I'm sure I don't have a firm enough grasp of how Minimalist for Gmail works. I know that most of the work is CSS, but likely a fair amount of Javascript to set things up and do the DOM traversals where CSS alone wouldn't work. I think.
If I'm right, it seems nearly impossible to get a stable solution simply because Google will be changing things like crazy to keep up with the competition, especially when iCloud shows just how far the server side can go.
So just how CAN you build a UI warper given all the changes the owner of the site is likely to do?
Just curious, and I REALLY like what you're doing. BTW, there's a great mathematician at UW, William Stein, who's revolutionizing math software:
http://sagemath.org/ .. you might want to chat with him about minimalism and math UI's.
-- Owen