This is Epiphany, a soft-styled menubar for Mac OS X Snow Leopard.
See attached readme for instructions, but please note, this is a Snow Leopard ONLY mod. Do not install this on Leopard, support is coming in a future release.
You need to do some tweaking if you want this menubar along with your current theme (otherwise installing this with a theme installed might mess things up):
*Reinstall your theme
*Launch the Epiphany DMG and right click on "Apply", show package contents
*Open SArtFile.bin with ThemePark (if you don't have it, download it)
*In ThemePark, keeping SArtFile.bin open, click "File, New" and then edit SArtFile, you should have two windows open now
*Copy #61, #62, #116 INDIVIDUALLY from the first SArtFile you opened, and paste them one by one into the new one we created. (if you don't want the new apple logo from Epiphany, just copy #116 then)
*Save the new one and apply
*Logout and log back in