Guys, I am in the process of renewing my wife's EAD and the online thing is so cool. It just takes 15 to 20 mnts at the most to fill the form and yes, as already noted make sure that you save the final form as a PDF and print it out.
Steps involved:
1. Get online, file the form online, print the form
2. Call the number given on the printed form to schedule an appointment for finger printing and photographs(even renewal have to do finger printing if you decide to file online form). Usually you will get the appointment the very next day.
3. Go to your local office(Or whereever you scheduled the appt) and have your finger printing done and photographed.
4. Send the supporting documents on mail to the address on the receipt - this includes the receipt, current EAD, i-485 receipt notice and EAD mailer(if you happen to have it).
5. Start the waiting game..... I heard USCIS has become a bit better at EAD these days.... So don't be surprized if the game comes to an end with in a month to 5 weeks.
Good luck everyone.