Nothing here is offered up as expert advice, I am still learning about these devices. Read and use at your own risk.

iPod Touch

Nokia N810

Nokia N810 vs iPod Touch
Compare
iPod
n810
This is not a phone!
Good
Good
I have wifi
Good
Good
I work with a stylus
Bad
Good
My touchscreen can use 2 fingers
Good
Bad
I have a GPS Built in
Bad
Good
I have memory
Good
16 gigs, no slots
Good
2 gigs + SD slot
I do not run windows
Good
Mac OS X
Good
Linux here
After searching for software, I can run VNC Viewer
Good
Good
After searching for software, I can run VNC Server
Bad
Bad
Plug me into a computer and I just work
Bad
Got to have iTunes unless you jail break it
Good
Memory cards mount as an external drive
 

System Specifications for my 2 gadgets

 
Nokia n810
iPod Touch
CPU
400MHz Texas Instruments OMAP2420  
OS Internet Tablet OS2008 (Maemo Linux) OS X 2.1 for iPod
Memory 128MB RAM, 256MB Flash 512mb
Storage 2GB internal memory, 4gig in expansion slot 16GB
Expansion MiniSD card slot (supports up to 32GB)
Compatible with miniSD and microSD (with adapter)
none
Wireless 802.11b/g, Bluetooth 2.0+EDR, GPS 802.11b/g
Display 4.13" touchscreen (800 x 480, 65K colors) 3.5" Multi-Touch display (480 x 320, 163 ppi)
Size 5.04" x 2.83" x 0.55" 4.3" x 2.4" x 0.31"
Weight 7.97 ounces 4.2 ounces

Here is the n810 with the windshield mount (not included with the n810)
and the GPS activated (zoomed out but my car is the blue dot).
n810 in action
n810 in action
parts