Thanks for posting the class and information, Nyneve. A few points of clarification:
* There is no "Extreme Ranger". The confusion probably arose because this PrC is especially easy for rangers to enter. The title may conjure images of potions of 'Dew, but it's also the only "extreme" thing in Eberron. I'd hazard a guess that the final name (it went through a variety of changes) came from the idea that the character is exploring especially dangerous and exotic locations, as opposed to peaceful cartography.
* To the best of my knowledge - and I may be wrong - this is the only PrC that specifically requires the use of action points in order to make use of a class ability. As a general rule, action points are an added ability that DMs can choose to ignore. The EE does receive additional action points, and at higher levels gets the chance to reclaim spent action points. And while the idea of an expendible resource may scare folks, in all of my sessions the balance has worked out fairly well.
* The goal is not to be a "munchkin setting" in terms of creating characters with ridiculous power levels. However, *a* goal is to allow players to perform heroic or colorful actions that they might otherwise shy away from because of the poor odds. They can't do these all the time - hence the use of action points - but when things are bad, they can push themselves to (here it comes) extremes.