I’ve used several apps now that launch the itunes store directly from the app. I’m even using some on my 2.1 iPod 2G.
I know there’s a bug in 2.1 that prevents appstore links from working in safari, but somehow people are launching the appstore directly, not even through safari.
How do you do this? Is it an undocumented openURL feature?
From iTunes, drag the icon of your app to the desktop, this will give you a link you can use directly (for example, http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=284036524&mt=8 launches the AppStore to Crosswords, both on a desktop and an iPhone).
Pop this into an NSURL and call openURL on it.