Hi, everyone!
I just came back from the cinema, where I watched "War of the worlds". And daaaaam that movie is like a already edited and specially designed scenario for a HL2 mod!
The storyline is like this:
You are one guy who works as a crane operator in a port (note that you could easily make a crane in hl2!), and suddenly strange things started to happen all over the earth. Big thunderstorms were rushing thru all the world and destroying every mechanical, electronical device possible (realisic thunderstorms - very possible with good entitywork and source's engine). Then after the destruction on the communications aliens with giant robots started coming out of the ground (note that those aliens were very strider-like and shot the same beams as striders!). Also the alien-creatures look similar to the vortigaunts! So your job is to form a resistance and destroy those aliens...
I think this mod would be pretty easy to make with some good mappers, modelers, skinners and perhaps with a lil' help from coding. I think that those, who have seen the movie would agree with me.
I can't map for HL2, but hey - what do you source mappers think of this idea?