Wow, this is actually a for real good piece of news and long overdue. No more mailing in the AR-11 form every time you move and then having USCIS bury the forms in a vault never to actually be entered into a database.
USCIS processes more than one million change of address requests each year. The new online service will reduce processing time and improve customer service by providing immediate confirmation that USCIS has received the updated address information. Overall, test users found the new online form convenient and simple to use.
USCIS also reports that address change reporting for naturalization applications will also soon go online.
The new web service can be found at http://www.uscis.gov/AR-11.