The design is pretty clean. Nice use of fonts. I was asking myself what the gray horizontal bar under the menu is for. It seems like a horizontal scrollbar to me but it does not respond to dragging (FF3/mac). And i would place the logo URL Flux to the left hand, instead of right. Because that's more standard.

I like it.

EDIT : I made a quick image for you (i also shifted the content a bit to the right) : http://dl.getdropbox.com/u/825545/urlflux.gif