Stardock has released Start8 1.20.
This program adds a Windows 7 style Start Menu to Windows 8. It is my personal favorite. Cost is $4.99 (U.S.).
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Release Notes
Start8 1.20 Changelog
-Updated for Windows 8.1 Preview build compatibility
-Start8 allows customizing the Start button image AND provides a desktop Start menu
-Added new prompt on first run to select a default button image. Upgrade installs will not see this prompt.
-When running on Windows 8.1 Preview, respect the OS configuration for “boot to desktop”
-When used with Stardock WindowBlinds, you can also override the Start button in use with the WB setting for “always use the OS” button
-Options for showing the Windows 8.1 Start screen in other than full-screen mode are disabled in this version of Start8