This is great, but I still think that there needs to be a way to make demo versions of applications. There are plenty of the more expensive apps that I would consider if I was able to try them beforehand. I'm not willing to drop $10-$20 on something that might be a buggy joke.
P-Worm
People can make demo versions, its just not built into the App Store, the developers have to make the demos themselves. I have been a few trials in the App Store.