Yeah, Last Man Standing seems like the most popular D3 coop mod.
http://www.doom3coop.com/
There are Linux and Mac versions, too. Newest version 4.0, right.
Someone could host a listen server like if it was a LAN. It's the simplest.
Ricky, I played some FFA last night on Lights Out and Tomiko Reactor with some random guys. It was fun, there is an element of sneaking around in the darkness as well as full-on firefights. You move at almost Quake4 speed in multiplayer, and the Berserk powerup works with all weapons (like a quad basically). You can't very well see players in the shadows in Doom3, so you can hide and blast others from behind. Not surprisingly, the chaingun and rocket launcher dominate.
The overall speed of gameplay seems to be slower than Quake, though. It's just natural.
I found that it really is more fun if you know the maps so you can find everything. I suggest we'd all learn Tomiko Reactor (D3DM1), so everybody knows where the guns etc are. It's a somewhat big map, too. The other popular FFA map seems to be Lights Out (D3DM5).
I'd be fine with coop or FFA. Short analysis of the Doom3 maps, with pictures, is here:
http://ucguides.savagehelp.com/Doom3/maps.htm
For a private server, we'd need a password, I suggest ilovetheshubhub obviously. Whoever hosts the server should name it something like "func server" so others can find it.
Let's do it :)))
Coop first?