Not that it's really a great game or anything, but there is an English language Chromehounds demo available on the Japanese Xbox Live Marketplace.

Here's how you can go about playing it:

1- Create a Japanese Xbox Live Silver Membership using these instructions

2- Log into that account and go to the marketplace

3- Go into the game demos section

4- Select Chromehounds and download the demo. It'll all seem pretty Japanese up to this point, don't worry.

5- When the download is done, go try it out - it should be a regular English demo.

To be honest, since the demo is all in English I don't know why it isnt available on the American marketplace. I'm sure it will be up there there soon, but if you want to try out the demo, give this a shot.

One more thing, when you download chromehounds, check out the Zegapain demo - it's all in Japanese, but it's seriously fun.

Oh, and if you try this, leave a comment below on what you thought of the demo.