I've poked on my laptop screen many times over the 3 years that I've owned it, and there hasn't been a problem. It's kind of cool, because when you press on it, it essentially causes little waves in the liquid that propagate outward like waves in a pond. As I've said, I've done this many times (not like I sit there doing it all day, but enough) and I've never had a problem. In fact, at the bottom of the screen where it attaches to the rest of the laptop, I can sometimes see little waves of the same sort -- I can only assume that it's because of the supports putting some sort of pressure on the LCD. Also, if I press hard enough on the BACK of the screen, I see the same effect. I do know that they're fragile and whatnot, but I think as long as you're not vigorously striking it, it'll be fine. They're probably not as resilient as CRTs overall though.