Doom 3 BFG edition is out this week, which makes it the perfect week for a Doom 3 BFG launch trailer. The repackaged, updated version of Doom 3 comes with 3D vision support and a new seven-level segment called The Lost Mission. The Resurrection of Evil expansion pack is included, along with Doom and Doom 2. The whole package is available at a budget £20 / €30 price point.
it sounds like Doom 3 has been significantly polished up with "improved rendering and lighting," more sensibly placed checkpoints and, countering one of the biggest points of contention, an armour-mounted flashlight. That should stop you from having to constantly choose between being able to see and being able to defend yourself. You can absorb some of that information in visual form with bonus demons in the launch trailer below.