If you manually updated to Droid 2.0.1, you will not receive a notification from Verizon's OTA Update Service.
You WILL receive a notification when the next version after 2.0.1 is released (2.0.2 or later, whatever comes next). Unless you manually download that one too!
If you have rooted your Droid ... YOU ARE ON YOUR OWN. You will never receive an OTA Update alert ever again. It's up to you to go out and get the updates and apply them yourself. Most likely, if you want to keep your Droid rooted, you will acquire the manual update from one of the Droid Gods who have maintained root access in the update that they publish for you.