Crysis.
Even the most casual of PC gamers have been looking forward to this game for some time.
And the release of Crysis and the 8800 GT just happened to come at pretty much the same time.
And that's good timing.
Here are some results from the single-player demo. We used the built-in benchmark flyby program to generate these results. As for settings, the game was run with everything set to 'High', at a resolution of 1280x1024. Sorry we could not include more results from this game -- but they will be forthcoming.
We substituted the RX2600XT Diamond Plus and BFG 8600 GTS out of this benchmark because, frankly, it would not be pretty. We thought it would be more useful to stick to the stronger cards.
The Forceware 169.01 drivers were used for this benchmark.

As you can see, Crysis is a very demanding game. Normally, with these kind of results (top cards barely breaking 30 FPS), I'd be inclined to go off on a tangent, about how developers make games with unreasonable expectations of the gaming public's hardware. But this argument doesn't stand for Crysis -- it's not that the game is not optimized. It's just simply a matter of amazing graphics that require substantial horsepower to push.
As a subjective interjection, I 'researched' the BFG 8800 GT OC on the weekend, as soon as I was able. If you have something somewhat similiar to my home computer (a E2160 Dual-Core running at 3 GHz, with 2 gigabytes of memory at 833 MHz), you can expect to get a solid 30 FPS with Crysis, at 1280x1024, on High detail, with this card. By a solid 30, I mean to say that there are no big dips in performance with many models moving on the screen. The game is quite playable -- of course, more frames would be appreciated...but, when a game looks as good as Crysis does, it becomes quite difficult to complain.