Might be old news to you guys but I recently installed the HL2:Substance mod and had a pop.
It was a truly humbling experience, never have I had my ass whopped so severely. Level 7 where you get in the jeep on the jetty and get lowered onto the beach was full of ant-lions and had about 3 big-mutha-fucka ant-lions running around too. Further on in the level I had to take out two gunships as well as avoid shedloads of ant-lions, combine and zombies.
I think this mod has the potential for some truly outstanding co-op games - shame HL2 doesnt have a co-op mod yet though.
Have any of you guys tried this mod yet? I dl'd it off fileplanet but you can get the mod here:
Substance mod
and the latest patch here:
Patch