I think you've nailed it, Ian. We _know_ that the DS is a great device, with tremendous potential. However, if asked, we can't really _prove_ that, because the software isn't there yet, the wireless isn't fully there yet ... it's like the DS was only half launched. The PSP has come out of the gate strong, the software quality is there to back it up, and everything that the PSP is exciting of is there, ready to be shown off. All the stuff we're really excited about with the DS doesn't exist yet. Both systems have additional future potential, but using the launch of each as a snapshot, I have to say that the PSP is coming out of the gate in a stronger position than the DS.
That's all I've been trying to say all this time, and poorly, I suppose. Nintendo makes devices with a lot of potential, but rarely capitalizes on them (see the unused expansion ports on their home consoles). I just want to see the DS live up to its potential, that's all, and first and foremost, that means getting some impressive games into the channel!
Something else I've noticed about the PSP ... there are two metal contacts underneath the 5V charging port, contacts that aren't used when you're using the included charger. People are speculating that a Dock could be a future option, I wonder ...