I'm just reading about this. Very cool!
A new SAE(J2534) standard starting with all '04 models with reprogrammable ECU's allows virtually anyone with the right equipment to reflash ECU's with the most current data.
Specifically, for Fords, go to www.motorcraft.com, click on Technical Resources, then Browse Subscriptions, then Ford Module Reprogramming. For $25, you get a 24 hour subscription.
Equipment needed is a newer(faster) PC, at least Windows 98 or above, a high speed internet connection, and an SAE pass-thru device(J2534). That is the pricey piece of the puzzle right now, ~$1000, but they promise cheaper versions by next year. The pass-thru device is basically a decoder that allows the PC to communicate with the ECU's, and their multitude of programming languages.(this pass-thru is designed to work with any brand vehicle). It's all done through the OBDII port.
I'm sure more info about this will start circulating soon. I got all this from the latest Service Tech Magazine. This is great news for us DIY'ers and independent repair/hp shops!