[gcanyon]

Two minutes in and I have:

   1. Figured out how to create circles -- sort of, by deleting and allowing it to recreate them
   2. Figured out how to set the diameter of circles by dragging the point on their circumference -- choosing a radius in the search box doesn't seem to work
   3. Figured out that small circles aren't possible -- both in NYC and SF I had to drag the center of the circle out into the ocean to get a circle limited to the airports I was interested in
   4. Seen the sign-in/ads dialog twice
   5. Gave up on actually trying it out.