I'll start with the bigger works along the north side of the mall — and give each artist's name after their work:
Susan Kay Johnson
Katy May Goodson
Jose Ignacio Garcia
Toward the west end were smaller works — mostly, I think, by kids and others who just walked up and started to draw. There were hundreds of them! Here are three that caught my eye:
The long walkway to the mall entrance...
...and a 12-minute HD video. I took it as I walked along the rows of murals above. (If you can't play it from the window below, you can try opening the video directly from YouTube.)
Update (April 11, 2013): The first of three pages of photos of the 2013 Festival are here: Park Place Chalk Art Festival, part 1 of 3.