Hi RxDiesel,
You have done your homework well, I see.
1. I'm running Mobile PC on an Acer netbook with XP and it works well. Volume of the audio from the laptop speakers for voice guidance can be an issue. There are a variety of solutions in some discussions on here if that becomes a problem for you. The 12V auto adapter is a good solution for powering. Fewer cables and neater than using an inverter and the regular AC power brick. I have no suggestions for mounting. I believe Ram has a new tray for smaller laptops like your netbook.
2. On the dash as close to the windshield as possible works fine. If you use a typical pickup truck mounting location your 3' cable should be adequate but if you need an extension you won't have troubles unless you get a really long one. You can save yourself some hassles by not messing around under the dash. Just lay the receiver puck on the dash, lay the cable across the dash to the computer and run with it. When you're not using it, stick it in the glove box or gadget bag out of the way.
A tip for stopping it from sliding around, as Ed mentioned, just get a little piece of non-slip drawer liner like
this. You can get rolls of it for a couple of bucks. It works nicely and saves you from having to glue anything to your dash. The stuff in the picture is the high priced stuff. You can get the cheaper spread with holes in it for less money and it works fine.
3. Yes. As Ed mentioned, Mobile PC actuates itself to the GPS receiver that comes with it. So you can install it on as many computers as you like. The nav functions won't work unless you have that specific GPS receiver attached. But you should have no trouble planning and saving routes and creating waypoints. The trick is how to get them from Mobile PC on, say, your desktop computer to Mobile PC on your laptop. You'll need to poke around in here and find out where Mobile PC's data files are. If you need help, please start another discussion on just that one subject. It's a real pain doing this multi-topic stuff. It gets hard to follow very quickly.
Same suggestion - new discussion - about creating your own custom POIs. You can do it but it's not trivial.
4. No idea. There will likely never be realtime traffic stuff available in my part of Canada so it's not something I've taken any interest in.
5. Yes. As long as you get the right ones. The downloadable ones
might work. The SD/micro-SD card ones will
not work. The ones on DVD will absolutely work.
6. As far as I know British autos have 12VDC outlets. I don't know if they are identical to the North American ones for plug shape. Perhaps someone else has an answer. Yes, the GPS will work just fine over there.
Y'er welcome.
...ken...