Developer: Jacob Leveto
Price: $4.99 Download on the App Store
GL Golf does not use the accelerometer like iGolf (and the Wii) does. And it is not free. As a paid app, it might be better suited for hard core golf gaming fanatics. But it doesn't disappoint.
GL Golf offers a selection of full 18 hole simulated courses (unlike iGolf which only offers a number of individual holes), including Old St Andrews. Each course is accurately modeled in 3 dimensions, making the approach shots, in particular, quite challenging / frustrating. As a player you can control loft, draw, and backspin, the season, the time of day and the course difficulty level. A welcome "mulligan" button lets you cheat, and take the shot again.
As much as we like the Wii style "swing with the iphone" idea, GL Golf is an app that you will keep playing once the novelty wears off.