TrendsMap is a slick application allowing you to see trends in realtime come and go on a map that you control. You can do the normal zoom in and out to see trends in specific areas. You can only view in so many times, basically to a nice city type view.
There is a world view, region, and city view with a simple click. Otherwise you can navigate anywhere you wish. If you select your area it seems to attempt to find you by where you access the service since there is no authentication.
Clicking on any word brings up the tweets surrounding it as well as local news articles around it! Very cool! You can then navigate to that word or place with a simple click. Clicking words like flooding also brought up inline videos. I was impressed yet again.
To fix: What was missing was the ability to specify a city to make the zooming easier. If it was there I did not easily see it which means most users would miss it. I also could not close the pop-up boxes, which was slightly annoying.
For help they have a tutorial screencast available in how everything works.