App Store To Get In-App Purchases

I was going to post this last week, but I've been sick. Apple is going to allow in-app purchases in the iPhone App Store. I'm hoping this will be a positive development. I'm also hoping that this brings about trial versions of software. One hard point for me in the app store is that I can't "try before I buy". Some developers will have a "Lite" version of a program, but not all of them.