Google Trends is a brand new tool that gives you the chance to compare anything you want. For example, according to Google, I found out that the West coast is much more popular than the East coast. I simply typed "east coast, west coast" and it returned a trend graph showing actual stats from the Google search engine in a timeline, along with dates of important events related to the search criteria.
In the Micro Persuasion weblog, Steve Rebel list 25 things he learned from Google Trends - one of them being which Microsoft Office application was the most popular. I knew the answer already (I'm sure you do, too); but it was still interesting to see the numbers that support it.
Very cool tool. Google has done it again!