Here's something I've always wanted to know:

Why isn't the Xbox Live Marketplace a global marketplace? Why is it that Japan, Germany, Italy get different things than the USA or Canada?

I found an official answer, and I'm going to put it up:

Q: How come my country doesn't get any of this cool content? What's up with that?!
A: There is no easy answer as to why every region doesn't get every single piece of downloadable Xbox Live content. In short, there are many factors that influence content availability that we don't control.
If you've ever tried to take your lemonade stand worldwide you'd understand. What happens if a country has enacted a ban on lemon-derived products? Or what if my lemonade fails to pass a certification board? Or what if yellow-colored drinks are not allowed for public consumption? And do I need a license to use lemons from someone else's orchard? Welcome to the real world where unfortunately/fortunately there are a host of conditions that influence and regulate what you can and can't do.
Governments, politicians, laws, regulations, video game rating boards, the ins-and-outs of licensing, Copyright and other Intellectual Property laws and treaties - any one of which can directly impact where content is available and where it is not.
In every region we offer content these factors are unique. There is not one single Video Game Rating Board that governs the ratings each video game receives. The United States and part of Canada have the ESRB. Japan has CERO. Australia and New Zealand have varying forms of the OFLC (Australia OFLC / New Zealand OFLC). Germany has the USK. Roughly twenty-five European countries have the widely adopted PEGI. And so on and so on. Not all governments are the same. Laws are different. Regulations are different. Cultural preferences are different. And let's not even start in on the licensing model for the entertainment industry.

It's from Major Nelson's Blog.

There are, of course, ways around the global restrictions.

It's really quite easy, just google it. If you have trouble, leave a comment and I'll help you out.