On Monday Google’s Latitude app finally became available for the iPhone, the app fully supporting iOS 4 and optionally providing constant position updates in the background on an iPhone 3GS or iPhone 4. Privacy is still a focus as users can selectively turn off both background updates, hand-pick a location or turn off positioning altogether.

Per Electronista, the official release comes roughly a year and a half after Google was forced to release an HTML5 version for the iPhone after Apple rejected the original version for reportedly being too similar to Apple’s own Maps tool. Critics have argued that the initial block was motivated by attempts to punish Google for Android, where Latitude has been a native part of Google Maps itself for most of the platform’s history.

It’s widely suspected that a loosening of App Store rules, prompted by Adobe-backed FTC and EU investigations into approval processes, may have changed Apple’s approach. Apple recently allowed Google Voice after a similar delay and what’s believed to be for identical reasons.

If you’ve played with Latitude and have any feedback, let us know.