Love that someone started this thread!! I just downloaded the free FORScan software on my laptop and purchased the ELM327 USB module to connect to my car. There's a bunch of cool things you can do as already shared in this thread but there's others also like directing the door chime and car startup beeps through the radio speakers - guess it sounds more luxury doing this.
You can change the tail light configuration on the Fusion, but not sure about Taurus but I'm sure going to try it out! I'm not a huge fan of the Taurus rectangle light pattern.
The Taurus has a Global Windows Remote Open, but for some dang odd reason it doesn't give you the "Close," feature but it appears you can program the Close feature also!
Dark Car Mode
Door Ajar Chime
Navigation on the go
Reverse mirror tilt
Heated Steering Wheel Temp
Automatic Turn Signal Count, etc...
Can't wait to get my module and start programming! I did a lot of this on my 2010 Audi S4 with the ***-COM programming mods - it's very addicting!
http://forscan.org/forum/index.php