Google incorporated a handful of new features into Insights for Search, a seven-month-old service that lets users find out how often keyword combinations are searched, where they are most often searched, and whether their popularity is seasonal.

Updates:

• New data sources. Insights now incorporates search data from Google News, Image and Product Search. "For example, retailers could use the Product Search filter to get a better understanding of what people are more likely to buy, and then stock the appropriate products," Google wrote.
• Category suggestions When you type in a search term, Insights for Search reflects all potentially relevant categories under which your term may be classified.
• Metros for the US. Drill down to specific geographic regions to get a sense of how search interest levels vary. Google pointed out this feature would be helpful for geo-targeting within AdWords campaigns.

For a visual sense of the feature update, visit Google's Insight for Search YouTube channel.