Just got my 900BT, and do not understand some of the descriptions of modifications due to my unfortunate lack of computer knowledge. What Hacks and Modification are the best, and easy to accomplish?

Thanks...

*Just a note: I had the stereo shop use the bypass, and it didn't work. DVD and address input are unavailable after about 7 mph with the presence of a warning message.

Well the best hacks and mods are all documented on this site. You can hit that search button and Im sure you will find them. Also, if the bypass they did for you doesn't work then they didn't do it right.

Honestly, if you don't have much computer knowledge, I would abstain from modding/hacking the unit in Windows mode... you could end up with a useless $800 brick on your hands if you do something wrong.