I'd recommend the FTB Launcher, which is somewhat easier to use, is much more up-to-date, and actually got permission from all the mod developers. http://feed-the-beast.com/
Currently running a Tekkit server, but I'm watching FTB. I'm waiting for them to add Redpowder/Thaumcraft first. Shame the worlds aren't compatible.
Once redpower is compatible with 1.4.5, they are adding it.
It's Lua, not LUA. Lua is the Portuguese word for "moon," and it does not stand for anything.
The console syntax seems to be Python. I'm excited how this could enable an easier modification of minecraft, especially for beginners.