Here's a small free app allowing you to make your MenuBar opaque if you don't like the way it is in leopard:
http://www.eternalstorms.at/utilities/opaquemenubar/index.html
install/uninstall instructions are inside of a download package (<500kb)
And the second option:
Another app which can be found here: http://homepage.mac.com/mdsw/ may allow you to choose the color of your menu bar - it edits your wallpaper automatically to add the strip of desired color
http://www.eternalstorms.at/utilities/opaquemenubar/index.html
install/uninstall instructions are inside of a download package (<500kb)
And the second option:
Another app which can be found here: http://homepage.mac.com/mdsw/ may allow you to choose the color of your menu bar - it edits your wallpaper automatically to add the strip of desired color