Chris Brian comments (sorry!) that his students are getting a lot of productive work out of their seven year old clamshell iMacs. I'd add that those iMac's specs are very close to the current XO specs. With a little historical perspective, we can see that's a sweet spot for basic desktop computing. If it is really "not about the technology," then a 466mhz processor, 256mb RAM, 1 gig hard drive is sufficient.