The Shadow of Kong
The BBC is reporting that the makers of the Kong game recommend against purchasing the 360 version of that title. The article states that an Ubisoft rep, Yves Guillemot, stated that the 360 version is just too dark to play well on a non-HD screen. However, Voodoo Extreme got in touch with Ubi for the official party line, and they had something very different to say. From the article: "Ubisoft is actively investigating isolated reports of resolution issues on specific plasma screens, which should be easily resolved by adjusting/increasing the settings. Ubisoft believes that King Kong offers one of the best gaming experiences available on the Xbox 360 and encourages gamers to check it out for themselves."
In addition, these consoles are marketed worldwide. The only country with a remotely significant HDTV acceptance ratio is the US, and even here it hasn't caught on as quickly as many have expected. The "HD era" is little more than a buzzword in Japan and Europe.