http://www.coj-game.com/
Just been checking this game out the last couple of days, and been too busy playing it to post up about it
It's a FPS set in the Wild West and you get to play as a selection of inter-related characters throughout the game
The graphics are amongst the best I've ever seen, and I reckon it looks even better than Oblivion, and at Full settings runs tons better than Oblivion did (Until I tweaked the hell out of Oblivion's .ini files)
If you really want to get the best out of the game then you will need some hardcore equipment
Gameplay is difficult, and includes a fair bit of difficult "Sneaking" or "Stealth", however you do get to break out the six-shooters and Winchesters for some good ol' fashioned Bloodshed. You also get to crack the whip and bash people with your bible playing as the Padre. Actually when you press the Fire buttons, he starts preaching bible phrases
This is a screenie from my rig, and I have also added some straight from the website - Here's mine 1280x1024 Running Shader Model 3, which with Nvidia cards unfortunately does not let you run Anti-Aliasing..
Click on images (Except the site ones) to view full size
*EDIT* I have played with the GFX settings a bit more, and am now running it at 1600x1200 with SM2 so I can run 8xs AA

Here's the results






My rig is a 3.4Ghz P4 with HT, 2 Gig ram, a single XFX 7800GTX 512M with factory OC and a Creative X-Fi Fatal1ty Card.



Grab the Multiplayer Demo from
here
And the Single player from
here
Or just check out the trailers:
Lo Res ~30M and
Hi Res ~65M
Enjoy