Yes, CN bought NotaBug. I'm not 100% sure if they own Infogami, though; there might have been some deal where Aaron got to keep and/or open-source it.
Re:Aaron Swartz explains why he left reddit
by abstractbill on Monday May 07, 2007 @05:41PM
(#20320)
The footer of the front page of infogami currently says "(c) 2007 CondeNet, Inc. All rights reserved." so I'd guess they own it.
According to the site, he's still part of the team. Was Notabug what Conde Nast actually bought? Do they own Infogami, too?