for some strange reason the crysis demo has a ton of content from the full game.. like all the weapons and vehicles and shit (the tactical nukes are fucking great).. and since they included a level editor with it.. ppl have made maps for the demo with all the shit available lol..
this one is pretty good:
http://rapidshare.com/files/66168850/level.rar.html
great to just round the corner to jamming station and theres a big alien attacking the koreans lol