Four years ago, Nintendo let the original Nintendo DS loose on the Japanese public. In 2005, the rest of the world joined in on the fun. So now, nearly 4 years later and despite Nintendo having already released one update to the DS line, it has introduced another. While the DS Lite turned the DS from an ugly duckling to a sleek and stylish piece of consumer electronics, the DSi takes the DS and adds more fun and games to the package. But is the upgrade worth your money?