'Windows 7' will be called Windows 7
In a return to simplicity, Microsoft has decided to name the next version of Windows "Windows 7". A while back, a Microsoft Evangelist told me there was only one product that kept its codename when it became an actual product. So I guess this makes 2. Any idea what the other one was?
Edit: Silverlight Travel writes: But Wikipedia says "Originally codenamed "Blackcomb" after the Whistler-Blackcomb resort. Renamed to "Vienna" in January 2006 and "Windows 7" in 2007."
Guess I should have done a few more minutes of research 
anyway the other product I was going for was Xbox but it looks like according to Wikipedia that was originally briefly called the "DirectX Box" so my info's off for that as well.