"I guess Google Correlate [googlelabs.com] is a dream come true for any person appreciating statistics and social science (or just likes to explore which line graphs match up). It is Google's newest addition to its already rich and powerful collection of data tools, which already include Google Data Explorer, Google Trends, Google Insights for Search, Google Fusion Tables, Google Visualization API, Google Chart API, or Google Wonder Wheel."
Link: Infosthetics