Quick update. I got an email today saying it would ship in September, so that's pretty cool!
Since the PSP can support large memory sticks, I think it would be neat too if there was a more regular way to get demos over the internet for it. They sort of do that, but it's only a few games, and they're massively chopped down and compressed to fit within a 32MB memory stick (since that's what the PSP originally shipped with).