Yes the cost is expensive but I like the concept. Still have my free runner and N900. Now I can upgrade still have a form factor, keyboard and screen I like. On a larger 2nd run costs can drop and others can pick up the same idea. BTW I have known web servers to running on the free runner ( only as demo concepts)
The love child of Openmoko and N900. I think if they deliver on the promise, this will change the way people view their mobile devices. Motherboard replacements and case replacements will gain traction just like in the assemble your own PC era.
The the good think about Openmoko is that you can install Qtopia (also under GPL now) if you want to by a simple one line command. I use it in that configuration as my main phone. I can't think of any other phone where it is so easy to choose the environment you want.
Rakshat
Disclaimer : I sell the Freerunner in India so my comments may be biased.