Part-Time Gods is an excellent game, in my opinion. It's one of my favorite roleplaying games to date (this coming from someone that has gamed two decades) and I can't wait to start playing it.
In this game, you play a god on modern-day earth, empowered with the powers of divinity... and you inherit the responsibilities and epic dangers of that station as well. You must face rival gods, mythical being called Outsiders, and quasi-divine people called Touched. You must also manage followers, protect your territory, and form pantheons (alliances) with trusted gods. Of course, while doing all this you have to maintain your job, pay your bills, make sure your kids do good in school, and get the oil changed on your car on Tuesday. (Wait, what?) See, that's where the "part-time" comes in: Your human life and its concerns don't just disappear when you're invested with godly power, and you must balance both halves of your life.
Each god has a Theology, which describes his basic beliefs and approach to divinity; unlike pantheons, which are local, Theologies are greater movements inside god society -- they are "splats," so to speak. You also have a Dominion, which determines what kind of god you are: Are you a goddess of storms, the lord of hawks, or the patron spirit of honor? Dominions are very open-ended, allowing you to play any sort of god you want. The system behind Dominions is one of the game's strongest points.
One of the biggest draws of the game in my opinion is the writing. Matters of theology and faith can be weighty and controversial, and some games (like Demon: the Fallen) spin that angle well. However, PTG's approach is more lighthearted. The game has a sense of humor woven throughout, making it an enjoyable read. Not that this is a comedic game or parody of itself; there's serious subject matter in the book, and being a god isn't always fun when an enemy god and his Outsider minions are trying to kill you. But the game doesn't take itself too seriously, and doesn't impose an overarching theme too heavily -- you can play up the drama, or comic relief, or whatever you want without compromising the game's intent.
I don't have the space or time to write a full review here, but I do have one on my blog if you'd like to read it:
[5 of 5 Stars!]