The writer behind such cinematic efforts as PG Porn and Dawn of the Dead (2004), James Gunn has detailed his recent experience with the Xbox 360's upcoming motion-sensing add-on Project Natal, revealing some new details and games.

Specifically, Gunn detailed a two-player river rafting game called "River Rush," in which players move in conjunction with an on-screen raft, and his impressions of the ball-whacking tech demo shown when Natal was first unveiled.

In addition, the screenwriter also made a passing mention of previously unknown (but expected) motion-controlled boxing and football games. In his words:

Then Dave and I played River Rush together. It's a game where you stand side by side in a river raft, so it's two people playing at once. To move right, you have to step right; to move left, you have to step left. As you rush down right rapids, you have to jump up and slap floating stars in the air � the whole raft jumps up every time you do. This game was even more exhilarating than the kicking one, and even more aerobically challenging. In fact, I'd say the ONLY drawback to the Natal some people may have is that you have to get up off your ass to play it. But, for me, a person who likes exercise and gaming, it's sort of a dream come true. An hour of playing Natal every night will definitely burn calories.

The Natal was an amazing piece of technology and I'll be the first one in line to buy one when they come out during the holidays. [Microsoft's Mike] Bayman told me there were boxing and football and other Natal games coming out, but I really, really can't wait to shoot someone on that fucking thing.

Moving into the realm of the inappropriate, a now-removed portion of his post also detailed his experience with "avatar-raping," though Kotaku has it archived:

As my avatar rubbed its crotch against Dave's avatar's ass the Microsoft folks started laughing and said that was the first time they had seen anyone do that. I was extremely proud of myself. I'm sure millions of little assholes will follow in the wake of my avatar-raping, but I want it to be noted in my Wikipedia page that I was the very first.

Microsoft expects to release the Xbox 360 add-on sometime this fall--the same timeframe that the PlayStation 3's motion-sensing PlayStation Move wand controller is due--with a number of developers and publishers on board. Pricing has yet to be revealed.