Once downloaded, wher are the install files so I can save them and not d/l again?

[madFinn]

If you right click the game in your library, and select the "Backup Game Files" option you can export a dvd sized file with an exe that will let you reinstall. I've done this for all the big games I've downloaded with Steam. Just copying your steam/steamapps directory may or may not let you re-use the files.