Now the following are two traffic stats graphs, the first one is a before the 2nd hubchallenge but about a month after the first challenge.
First Traffic Stats
Now here is the second traffic stat image.
Update - here is another traffic stats graph at date 20th November 2009 and it shows the traffic grew to 2000 views before dropping to 1600 ish views, so it's growing the traffic these Hubchallenges!!