As the tagline says Google Insights lets you “see what the world is searching for.” Basically it is the same as Google Trends in this respect but the great thing about Insights is that it lets you compare search volume patterns by category, seasonality or time frame and geographic region
It is very easy to do this as well since you only need to tick the circle that corresponds to how you want to compare the search terms volume pattern, enter the search term, and choose your filter, then click on the search button.
For example I wanted to see how the search volume pattern of the search term “seo” in the United Kingdom. What is returned to me is the search volume from 2004 to 2008 which shows a steady increase in search volume. Regional interest results in the search term shows that if you want to target specific areas the best areas to target would be England first then Wales and Scotland. Forget Northen Ireland, Isle of Man, and Channel Islands because those regions don’t show any search volume for the term SEO!
As for your keyword research you’ll be glad to know that Insights also lists the top 10 related keywords and the top 10 keywords that are rising in search volume. With SEO the top rising related terms searched are “wordpress seo”, “what is seo”, “seo tool”,”seo tips”, and “seo jobs”.