An iPad in car dash system will be a godsend to people like myself as long as it can deliver
Music,
Navigation,
Video, and
Bluetooth Phone Connectivity in one easy to use interface. I've always wanted a Car PC but they all just seemed too yesterday and tedious to get running.
part of why carpc's are a hobby...
In comes the iPad, true the size will be awkward, but hopefully after a jailbreak
assuming that apple will allow it to be jailbroken at all--their track record with patching holes in iphone updates doeesn't look too promsing or countless complaints to Apple, Landscape mode can be an option for everything. Once this happens it should be a lot easier to plant one of these on the dash. I currently own a Kenwood DDX8109 with all the extras, Bluetooth, GPS, Amps, etc., paid about $5000 for everything installed and I can honestly tell you it was totally not worth it.
a carpc can cost just as much
The interface is slow and extremely dangerous, touchscreen has a mind of its own, no multitouch, bad in cold weather
you realize that capacitive touch won't always work with gloves and cold or dirty fingers right?, bluetooth works nicely only with lower level phones like flips, Garmin Nav is slow when typing, video looks awful, the list can go on and on.
I need something that will keep up with the times and what better than an iPad
maybe a well planned car pc?. Every developer and their momma will be touting out apps for this thing and you can bet on some of those being designed for cars
there are thousands of apps already, and none of them are for cars, so why would the ipad change that?. I wouldn't even be surprised if Kenwood made a nice app to go with a one-size-fits-all dash system. They've worked with Apple before and still do with many of their products.
what apps has kenwood made? i thought they just allowed their HU's to control Apple devices? They really aren't selling in-car dash systems anymore
this is more personal opinion(i am not big on kenwood either, but...) kenwood is a huge company, and so they must be selling something, and someone must be buying it, otherwise, they would not exist.. like the OP says but they do have some understanding on car audio. Imagine a car setup that was based on an iPhone, iPad & iPod Touch.
we have imagined it, and there is even videos of itouch-run setups in the blog, and entire threads about ditching carpc's for a itouch/phone/pad setup
You could use your iPhone to control your setup if you ever forgot your iPad but if you wanted complete control or more choices, you bring in the big guns (iPad).
Regarding Multitasking, I feel everyone's pain but from news reports it seems it will be coming soon or you can always jailbreak and use what's already available, I think its called Multiflow. I currently use a
Palm Pre and Multitasking is just a way of life for me
so if apple won't allow it, then you will need a real carpc 
. I would much rather have an iPad sized WebOS device in my dash but from the looks of the company, they need to focus on staying alive. If either of those don't happen or work, hopefully some type of app will allow cross interaction for music, nav, & video eliminating the need for multitasking while driving.
Touching on this device being underpowered or slow, I highly doubt it. The iPad isn't running a full fledged OS like
Windows 7 or Snow Leopard, and it will be running on a fast 1GHz A4 made by Apple themselves
from what i have read, it is based on the iphone/touch os, so if you have ever tried running simultaneous apps on one of those(i tried running pandora, and notepad at the same time once using backgrounder on a iphone 3g-- notepad wouldn't even open until pandora crashed itself...), then you have a idea why most don't think the ipad will have multitasking. From speculation it will help with battery drain and I'm all for that.
So summing this up and adding some extra pointers, the iPad is a godsend to in-car dash systems because:
a) Large Consumer Base
b) Large Developer Base
c) 3G,
Wifi, A-GPS, Compass!!
d) Cheap
actually, i don't consider it cheap at all-- base price is about $600 + the data plan that would be required for most features to work-- at about $50/mo, that is another $600, just to run it for a year, so the end cost after a year is $1200-- that is the cost of a cheaper, atom based car pc, that has no recurring costs(using a wifi card)...
e) Multitouch
f) Apps Galore
all of the apps that are in the app store now are designed for the itouch/phone, which are no-where near car friendly...
g) Jailbreakable for non approved Apps
assuming that apple will play nice--and they haven't so far with the itouch/phone jailbreaks-- every apple os update closes a hole that the jailbreak uses to jailbreak...
h) Keeps up with the times
opinion-- technically, there is no electronic device that will ever keep up with the times--everything is outdated in a month or 2..
i) iTunes in the Car!
that could be taken as goor or bad-- in my experience, bad(my itunes has a bad habit of 'losing' songs, that i know used to be there, hence, i must keep multiple audio backups in multiple locations...)
j) Fast
the software or the device? my old dual core 1.2ghz atom carpc was fast and could multitask...
k) Multitouch Soon...(or with a jailbreak)
apple likes to toute multitouch as a feature, so i think that it will include it, but i haven't seen too many apps other than picture, map, and gaming apps take advantage of it(are there any music apps that use it currently?)
l) Take it with you out the car
a netbook/laptop carpc also has this advantage
100,000+ more reasons (App Store)
i would count the app store as a dissadvantage-- it could be a limiting factor if the device cannot be jailbroken.....
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