Want to check if your Android phone has been rooted properly, there is a solution for that. XDA member JoeyKrim has made a little app to check root access as well as Busybox installation on your Android device.
There are two simple buttons in the app, clearly marked with their functions, which Verify Root Access and Verify Busybox Installed. All you have to do is click one or the other depending on what you want to check.
Root Checker is available for free in Android Market.