I feel that the potential for iPad apps to be more expensive definitely exists and depending on the quality of future apps, prices should increase. I'm sure that somewhere down the line a killer app that utilizes the larger screen and offers methods of using our fingers in ways never imagined will show up on the scene, totally justifying the higher price of iPad apps while raising the bar for future devs. People arguing the fact that "it's just a bigger ipod" aren't seeing the entire picture. Bigger also means you can fit more fingers on the screen to do more! Imagine playing the piano on your ipad...(or maybe not lol) In the end I think quality will speak for itself in terms of determining the price of apps. I'm not going to expect to buy fieldrunner-quality apps for 0.99, or even 2.99... Or I will expect prices to be in that range, but still end up paying 5-8 dollars for a game. It all depends.
Well, it seems from some of the posts from TouchArcade that the iPad games are indeed more expensive than those on the iPhone. I think it's for the better, personally. EDIT: iTunes reviews seem to get higher ratings too, possibly because the people buying this apps aren't n00bz like those people complaining that the app is shutting off their iPhones. Don't jailbreak your iPod, stupid! Hopefully the iPad consumers won't be n00bz like half of the iPod Touch consumers... that could also prevent jailbreaken iPads from going viral, because personally I disagree with Apple piracy. (don't start a flame war)