While the Expo isn't going to be set up until Wednesday, I took a look around (MobyGames is an exhibitor as well as press) and saw an incredibly diverse portfolio of exhibitors. Some middleware companies, such as fmod, Rad Game Tools, and CRI are here. 3-D control device vendors are here as well, along with Autodesk (hey, someone has to make all those 3-D models). There are also some unlikely exhibitors, like Sun Microsystems, who is evangelising java as a gaming platform. More on that later, I guess.
The booths and displays are looking like they'll be the biggest yet; Sony's in particular looks like it's going to be some sort of dual-platform riser, with meeting rooms on the top platform. Just another reminder of how big the business of gaming has become.