Here's the blurb for the talk:
Lua is a remarkably expressive programming language, given its strong focus on simplicity. Although not widely used, it was come into its own as a scripting language within applications, especially games. Its straight-forward C API makes it easy to embed within software written in other languages, and its small size and fast virtual machine make it an appropriate choice for performance-critical applications.
My slides are available in S5 format.
If you want to know more about Lua, there's more information about it on lua.org. The reference manual is available free (see the documentation page), and the last-but-one edition of Programming in Lua is available on the website as well, although it's worth getting the dead-tree version if you get serious about Lua. There's also a lot of useful information on the lua-users site.
Lua can't do much out of the box (the standard library is very small), so you'll want to look for libraries on LuaForge.
The Lua code itself is published under the MIT license, so you can do pretty much what you want with it.