Is there a way to place a pin into the google maps iphone app using openURL?

You can use a URL of the format: http://maps.google.com/maps?q=Your+Location+name@latitude,longitude

http://maps.google.com/[email protected],-87.6315

You can drop up to 100 pins using KML. There is an example of this on http://appsamuck.com look at the example for day 8 (http://appsamuck.com/day8.html)