Case in point: I attended the Infochimps Data Cluster Meetup. They kicked it off with a debate around SQL vs NOSQL. 5 minutes into one of the NOSQL guys saying why his stuff is great, Werner Vogels gets up and basically lays the smack-down on the guy. This talk is followed up by BOFs on different aspects of working with big data.
I guess this wasn't an official SXSW party, but you'd really have to not be keyed into the events around the conference to not know it was going on.
EDIT: I should also point out that the guys from Factual, WolframAlpha, Rackspace, Cassandra, (oh and me from 80legs :) were there. It was really awesome.