For all you iPhone users out there, there is a new application called gpsWaypoint that just became available.
gpsWaypoint allows a user to access their Jeppesen subscription information using their iPhone or iPod Touch.  The app uses Apple Push Notifications to alert you when new aviation databases are available.  gpsWaypoint includes the documented update schedules for both Jeppesen and Garmin aviation databases.  It supports multiple aircraft and accounts and works over 3G or WiFi networks.  Best of all, it's FREE!
Check it out at http://www.gpswpt.com or log on to the iTunes store and search for 'gpsWaypoint'.
Enjoy!