I don't have 3.0 installed on my iPhone. But multiple people I trust have said the same thing.
arn
I redact my previous posts regarding the article's inaccuracy. Upon further trial, it seems that larger applications give me the buy dialogue and smaller applications give me the free dialogue.
For instance, Super Monkey Ball and Fastlane give me the buy dialogue, whereas Camera Zoom and Fuel Gauge give me the free dialogue.