The Shazam developer collected device IDs, so that beta testers can now install the free version and still get to the things you could do in the beta (unlimited tagging).
So, with a bit of preparation they could have handled Tweetie customers differently in the Twitter app.
Yes, the 'soapbar' design of the earlier iPhones fit your hand much nicer. While not exactly painful, the iPhone 4 edgyness actually hurts your hand a little. Also, it's way more slippery. And how much better the antenna design may be, I can get it to disconnect from my Airport Extreme 6 meters and a chalkboard-wood-and-rockwool wall away; just by holding it in a comfortable 'landscape' grip over the top of the iPhone.
So, with a bit of preparation they could have handled Tweetie customers differently in the Twitter app.