Just a small point, but on Firefox on Linux the "Lost Password / Register " links don't render properly (unless you make the font really small). Makes the page look a bit messy.
I see. If you've forced bigger fonts it pushes things around some. I'll have to work on that. A white-space: nowrap for that div makes the login form unbreakable, but it can break the rest of the page with fonts even two notches bigger than what I've specified. That's a problem (I force bigger fonts myself, quite often...).