FlightAware has released flight alerts into public beta. Now, you can receive automated tracking notifications from FlightAware via e-mail or instant message (IM).
To get started, simply click "alert me" on any flight page (at the top of the tracking box) or visit http://flightaware.com/live/alerts/
to manage your alerts.
Currently, the only instant messenger supported is Jabber IM although but we'll release AIM/AOL IM later in November. Additionally, expect to see other improvements such as the ability to request a notification [x] minutes prior to arrival.
Thanks for using FlightAware, enjoy the new feature, and please send us feedback!