The new Keynote Remote will allow you to control the new Keynote 09 straight from your iPhone. Unlike the free Apple Remote for iPhone-which control iTunes in your computer-this one costs .99 cents.
From the iTunes App Store:
• With Keynote Remote, you can control your Keynote slide presentation on your computer from your iPod touch or iPhone.
• Swipe to advance or return to the previous slide.
• In portrait mode, see your presenter notes on your iPod touch or iPhone. In landscape mode, preview your next slide.
• Keynote Remote works with your Wi-Fi network, so you can control slide playback from anywhere in the room.