Another similarity between DS vs. PSP and Wii vs. PS3 is that in both cases the Sony systems are oddly not moving games. I would say it's because people are using the PSP for UMD movies and PS3 for Blu-ray but neither of those formats are selling terribly well. What are people doing with the PSP's and PS3's they're buying anyways? I can't imagine too many people think struggling to get linux to do whatever it does on the PS3 worth the effort, nor do I find running up my electric bill to help so researchers get grant money a reason to shell out $600. Whatever people are doing with them, they aren't buying as many games which is what they are supposed to be for.
At any rate, I think the difference between the DS' slower start and the PSP's stronger start compared to their console bretheren was that the price difference wasn't as great, the DS felt rushed (which it was), new way to play games wasn't established as a successful strategy yet, and Sony still had its fawning media coverage that duly called the race for the PSP before either system launched. The Wii on the other hand benefited from a far greater price difference in its favor, had the time to build a massive groundswell of interest with its E3 06 showing (although the games still feel a bit rushed, they're still nothing like the rank tech demos that were sold as games for the DS' first 6 months), launched with 2 mega games, after the DS most were interested in how a new way to play games would translate to consoles, and lastly Sony did an expert job of demolishing the 10 years of slavish media coverage it had enjoyed prior to the PS3.
