One of the biggest complaints made by new Leopard users is the semi-transparent menu bar. Depending on what wallpaper you have set on your monitor, it can get pretty funky up there.
It was bound to happen sooner or later, but barely 3 days after Leopard’s release we now have a simple app that changes the menu bar to solid white.
OpaqueMenuBar from Eternal Storms seems to just simply put a white bar over the menu bar. The only negative thing I found was that on dual-monitors it puts the white bar across both monitors instead of just the “master” monitor that has the menu bar.
OpaqueMenuBar is free for the taking.