Desktop users of Windows 8, you don't have to fear the Metro start menu! I, too, was at first taken aback when I'd be shunted back to the Metro Start page after clicking the phantom start button, which in the Windows 8 Consumer Preview only shows up when you move the mouse to the lower-left corner of the screen. But after a little while of using the new interface metaphor, I found the switching smooth and unobtrusive.
Stardock's Start8 Utility
Start8 comes from longtime Windows customizer Stardock. It doesn't actually reproduce the Windows 7 Start menu's functionality—like showing most-used and pinned apps. It actually just displays a smaller version of the exact same Metro Style search page that you'll get from the Windows 8 charms search option. So really, all it's adding is the Windows button of dear memory. The implementation is kind of a mess: You lose the ability to go to the actual Metro Start screen unless you run a Metro app first and then choose Start from the Charms. Setting can change this, or even have it show the full screen Metro Start screen, but then why install Start8 in the first place?