Funny easter egg: Click on the credits button, and after they all scroll by (or after you skip them) you'll see a pretty funny movie of the summoner characters playing traditional pen&paper D&D with a guest appearance from Volition's Red Faction. It's hilarous and it's also quite long, not just a 2 sec. skit.
The clip was produced by the Dead Alewives, an improv/comedy group from Wisconsin, and written by Dan Harmon. You can also find the movie in the game's directory as (appropriately named) geeks.bik. In the PS2 version, the movie is named geeks.pss.
This is a complete conversion (with a few improvements) of the PS2 title of the same name, which at the time of release, was the only RPG on the system.