Got a few of them don't you well I'll try to answer them as well as I can.
First off a blind monkey can make a carputer, the problem is trying to keep it running .
1. Laptop setups are the easiest way to go because you can get a docking station and be done with it. But laptops have cheap sound quality and no room for expansion. I would not recommend this. Building from scratch is better and it's not really hard to do so we don't do it for the challange. Like I said a blind monkey can do it.
2. I already answered this. Ok let me see for carputer most things you need are: motherboard, memory, HD, dvd drive, powersupply and screen. Most of the things I mentioned are standard. Meaning people usually by the same things, Epia, slim dvd, ..etc.
You want to learn more just ask here.
3. Yes your finger will actually be the mouse. Touchscreens are really like those drawing pads you see some graphics people using. It's a clear glass panel over the actual lcd screen. It's not windows xp specific, it's just a pointing device like your mouse.
4. The program below is called MediaCar made by a member of this website. And yeah there is an acura version of it. Basically its just an interface for the basic things you'd use in a carputer. You know other then going to start..programs..(program) everyime. You'll worry about this when you build the actual carputer. I think Coyote made MediaCar.
5. GPS receivers basically lock on to the 12 satellites in orbit and pinpoint your location accordingly. I really don't know much about this but basically you have your receiver it locks onto a good signal and your ready to go with your gps program. It's free, enjoy.
6. Are you saying you only have 2 din spaces? I don't know what the lilliput dimensions are but do a google search. Most people will just cut out the trim on your dash to make it fit, no problem.
7. Voice activated software is not possible yet. Atleast not really.
8. Vertical is fine.
9. You do have to worry about heat. Generally the trunk is the coolest area. If you put a few good fans to circulate airflow that's usually enough. That's what we do when we build our own custom carputers. I put my setup into my glovebox with enough fans to keep it running stable. Yes laptops require cooling as well.
10. I'm not even going to get into this din sized pcs. Usually they are unpowered, slow cheepie boxes. But that's just my opinion.
11. VGA= video graphics array. I have no idea what 2x pal/ntsc is but PAL and NTSC are the video standards. NTSC is international while we use PAL here in the uS or vice versa.
Basically you WANT a xga (vga+) screen such as the xenarc or lilliput. Don't
even think about getting some lazy tft-lcd rca/svideo screen.
12. If you have wireless internet in your car, yes. But I wouldn't worry too much about that. Like that saying, "Relax, your not important enough to kill."
13. I actually have a usb mouse and keyboard in my trunk and I never take it out. After a little practice you can do everything with a touchscreen and your finger.
14. Lilliput, xenarc screens come with a touchscreen already installed. Go for the flush mounted dash, it's a very easy way to do it with some fiberglass and bondo.
15. I don't know anything about bluetooth, edge...etc. But I'm sure someone else can clue you in.
16 . If you go that route then your done. Besides a few wires and extension cables (usb, vga, serial..etc).
17. You probably mean power sources such as a dc-dc power supply. That's only necessary if you build your own box. Such as your home computer has a power supply you plug into the wall correct? what that does is convert the 110 volts AC current to 12v DC current that your computer can use properly. In the car your car battery/altnernator puts out anywhere from 10-15 volts typically 13.4 volts. Your carputer will want 12volts so a dc-dc handles this problem. But you seem to be putting a laptop with a broken screen so don't worry about this.