Google just combined Trends and Insights for Search into one product.

According to Google Support:

We have launched a new version of Google Trends, bringing the great functionality of both Google Insights and Google Trends into one. Following the release of the revamped of hot trends and the special olympics addition, this release should make it even easier for you to tell stories about search and explore what people are interested in around the world.

As these product are now one, Insights for Search is being deprecated. We are working hard to make sure that any URLs you might have stored for Insights/Trends will be gracefully handled by the new united site.

Google Trends previously detailed how often a particular term is Google searched relative to the total volume of searches conducted across the world; where as Google Insights for Search provided, well, insights into those search terms. Unlike Trends, Insights for Search also provided a visual graph.

Now, both products have been folded and redesigned into a fancy new tool:

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