Lua

So what do you think of Lua?
I'm considering it for my X3 inspired(cloned) game as a scripting language for all the entities, and co-routines emulate the "@" operator of X3 scripting language perfectly.
I just hope I can integrate it to my code without much trouble.

Probably the best choice for a C-embedded language, but it is pretty slow. I find its exclusive use of double somewhat troubling, and the need to declare just about everything local is a little irritating, but it is otherwise excellent.