This site updates semi-frequently.
The guys at VarsityBlue have some new pics up
Construction is coming along well
http://varsityblue.blogspot.com/2008/07/construction-pictures.html
There's a Flickr account with some that are about six weeks old: http://www.flickr.com/photos/cseeman/archives/date-posted/2008/05/24/page2/
(it's not my account btw)
too bad its still going to be filled with this
It seems like every time I take pictures, someone else also gets the initiative to go over and take some as well.
Mine aren't much different than Varsity Blue's (and I didn't have time to get over to the West Side), but they're something:
http://picasaweb.google.com/blakecoe/MichiganStadiumRenovation62908