Damn! I've also been checking almost everyday for the app to drop as well. Now I see this :-( Yeah, I'm surprised they dont allow a monthly recurring pay option. Pandora Radio does it. I can't remember how they did it, but I think it was a seperate purchase through the app store, not an IAP. Maybe they'll allow you to do something along those lines. Check into how Pandora does it.

Here's an excerpt from my monthly renewal of my Pandora account:

Dear H***,
Your subscription to Pandora Radio will automatically renew on 02/10/12

To cancel auto-renewal or manage your subscriptions, click below and sign in to your account.
Go to iTunes.

Regards,
iTunes Store Team