If you're interested in Google this article is a must read.
The SF Chronicle has obtained some internal Google memos about the companies global expansion. Verne Kopytoff writes, "Analysts say that Google must succeed internationally to ensure its future health. But the young company will have to play catch-up in some key nations, particularly in Asia, precisely where the potential for future growth is the greatest."
What about the internal documents?
"They show that Google's business, though global, is concentrated in just 10 countries. They also reflect the company's frustration over its billing system, which couldn't accept some popular payment methods from advertisers in some major countries. The system, scheduled for replacement earlier this year, was blamed for lost revenue."
Much more in the SF Chronicle article.