Even a slow Sunday gets its DOOM 3 post du jour, as there are a pair of previews of the imminent shooter online this weekend (thanks Frans). There are previews of the game on GameSpot and on IGN based on getting to check it out at the G-Phoria deal from G4. Here's a bit from GameSpot::

The Doom 3 demo station at G-Phoria didn't subject eager attendees to the game's introductory segment, which is reportedly set before all the hellish action picks up. In fact, our experience with Doom 3 started with the second level of the game, at which time the nameless main character is tasked with navigating the labyrinthine research base and briefly traversing the Martian landscape in search of a missing scientist. Right about the time you find this scientist, all hell breaks loose--literally--as a terrible presence overruns the base and your former comrades begin to turn demonically against you.