The Elder Scrolls IV: Oblivion
For the past year, I've been anxiously waiting for this title to be released, hoping that when it does, my box would be muscled enough to let me play it. Oblivion is now available to the public, and Guess what? My PC isn't fast enough, and I still can't afford a 360. Bummer.
If you want to know more about Oblivion, Ars Technica has published a side-by-side review of both the Xbox 360 and PC versions.