>> Let us also not forget that Source will have several months of exposure before we even see DOOM 3 hit shelves. Lot's of people are hungry to write mods, and Source tools will be in front of them way ahead of the DOOM 3 tools.
With the map editor build into the engine I know people that are aleady creating new maps for Doom3 using the leaked alpha build.
It also includes tools to create light and bump maps from lightware models.
D3 alpha also include a pretty simple and effective camera system. I've already created a simple map and added a camera to fly around the map on load up.