Siri can already help you book restaurant reservations via OpenTable and let you know who won's last night's Yankees game. But now it's time for Apple to open the door to other developers. "What's the lowest price you can find me for a flight to San Francisco June 11?" "Sell my Facebook stock!" These are just some of the scenarios that are possible once Apple lets the likes of Kayak and E*TRADE tap into Siri's brain. Forgive me for being greedy, but I'd also love to be able to say "Favorite this song" or "Ban this track" while listening to Pandora or Slacker.