I upgraded my iPhone to the “unofficial official” 2.0 software today — and all I can say is wow. The App Store kicks some serious boo-tay.

I installed the Pandora app this afternoon. I had “Go with the flow” from QOTSA streaming in my car on the way home. So awesome.

If you already have an iPhone, the App Store is where it’s at. Especially since it looks like the upgrade will really cost you somewhere in the neighborhood of $559.

That’s the $199 price tag for the new phone, plus an extra $240 over 24 months for the new data plan, plus another $120 over 24 months for the text messaging AT&T took out of the iPhone v1 data plan.

10 bucks more a month for the new 3G data plan wasn’t such a big deal, but the fact AT&T is sticking it to you with the text messaging plan is a bit much.

Either way, the App Store is the game changer.