Plugin mastering limiters- What is look ahead?

http://www.omniaaudio.com/tech/lookahead.htm

This page is pretty clear on the basic idea...

While you might think a "look ahead limiter" makes a lot of sense? That's not always the case. In fact, I find that look ahead limiting can really destroy the impact because it already knows when the impact is coming. But for broadcast purposes and other applications, a look ahead limiter can prevent any "overs". That doesn't ensure the fact that a look ahead limiter is better than a conventional "let the peak through before I react" limiter. In fact, that's frequently what I want. I want that initial peak to slip through. And then it compacts the rest of the meat. In fact I count on that happening. People only created look ahead limiters because they are control freaks. I'm an out-of-control freak. And that's why my recordings are so good. My out-of-control controls are highly controlled by my out-of-control instincts.

Thinking around the box. Around and around and around surround.
Ms. Remy Ann David

Remy woke up pretty inspired. :)

I don´t think look ahead is all that bad once you can control the time period of the predictions. :)

I like PSP Xenon and TC MD3 TDM.
People also talk about Elephant, L3 and Sonnox.