UPDATE from Hayride:
Originally, we found a MySpace page which looked like it might belong to the D-Bloc in question. That wasn’t the guy, so we’ve taken that report down. With a reasonably high degree of confidence we think “D-Bloc” is someone named Dylan Barr.
The evidence that this guy is the one we’re looking for is piling up fast, and we’re going to have an entire post on him shortly.
http://thehayride.com/2010/04/the-french-quarter-fracas-meet-dylan-barr/
The French Quarter Fracas: Meet Dylan Barr
http://www.humanevents.com/article.php?id=36624
New Developments Identify Lead Protester in Jindal Staffer Beating Case