[teamonkey]

I would say that the vast majority of games out there use some sort of embedded scripting language.

For a AAA game, the core game engine (graphics, audio, AI, physics, low-level gameplay logic etc.) will be written in C/C++, but scripting engines are used a lot for high-level game logic and AI, at least at the prototyping phase.

LUA is very popular (but not LuaJIT as it doesn't run on the consoles). Every Unreal game uses UnrealScript and/or Kismet. Eve Online uses Stackless Python. GTA IV uses a 1st-party scripting language.