Mapping Travel Times — Comments & Critiques?

How long does it take to get everywhere within a city by only walking and riding public transit? How does that change depending on the time of day? I spent the last couple months trying to answer these questions, and I finally deployed my answer to the below website.

http://geoss.colorado.edu/traveltime

If you have a moment, could you please send me your comments or critiques? Your input would be greatly appreciated as I try to polish this into a portfolio piece.

Thanks for your time,
Andrew Hardin
Andrew.Hardin@colorado.edu

01/17/2014