If you don't speak English (you're probably not reading this), but you'll be able to use Google Insights for Search if you do speak one of the 39 languages that now have access to the tool. They are: Bulgarian, Catalan, Simplified Chinese, Traditional Chinese, Croatian, Czech, Danish, Dutch, English (US, Australian and UK), Estonia, Filipino, Finnish, French, German, Greek, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Latvian, Lithuanian, Norwegian, Polish, Portuguese (Brazil and Portugal), Romanian, Russian, Slovak, Slovenian, Spanish, Swedish, Thai, Turkish, Ukranian and Vietnamese.
Google Insights for Search launched last August and shows stats on keywords that you enter in. It's kind of like Google Trends on steroids.
Google is also adding some features to Insight for Search. There's a new forecasting feature that makes predictions based on historical data and search patterns.
Another new feature is an animated map. This allows you to view how a search term has trended over time in various locations. Look for the "View Change Over Time" link under the map.