The private beta now being held for Waze at the Windows Phone Store needs beta testers (natch). You can head over to the sourcelink and create a new account that will allow you to make sure that the app works just as amazingly on Windows Phone as it does on other platforms.
If you're a Windows Phone user, this could be one of the big name apps that you have been waiting for along with Instagram. It might not happen as quickly as you'd like, but the Windows Phone Store is beginning to fill up with the same apps that populate the Apple App Store and Google Play Store. Now if only the Windows Phone Store could snag Instagram.
source: Waze (1), (2) via WMPoweruser