For the record, this is true with Android too. I can transfer all Android apps between different devices tied to my google account. All of the apps from my Droid were available for my Droid X, and for my Galaxy Tab. pay once, use forever.
The ipod/iphone app syncing is pretty cool since it is tied to the account on itunes and not on the phone. SO when my kid's friend got an ipod touch, my kid made sure he got all of his apps.
Never said it wasn't the same. I just find that it is easier with the iPhone and iTunes. The wife and I had Android phones and it was a PITA IMO.