When the CPU nears 100 degree... well its not good for it
Unless you're using a MacBook, in which case that's just standard operating practice. It's not exactly on-topic, because sweet Jebus are they awful for games (AI War runs fine, but I can't even get Portal to run smoothly at the native resolution on the lowest settings, and this thing's less than a year old), but they are super under-aggressive about cooling, and I can never resist a chance to rant about it. Oh no, we can't have the fan run any faster, or that would make audible noise, and that would be sad. It's really funny watching it decide that it's perfectly acceptable to lower the fan back to the low default speed after it gets the CPU back under 90 degrees. Or at least it was, before I changed the settings so the poor thing wouldn't burst into flames...
I'm not entirely up to date on laptop hardware, either, but when I was looking last year, Asus did indeed have some pretty decent stuff. You can get fancier and more powerful hardware from some of the smaller "enthusiast" companies, but I didn't look into most of those too much, because they mostly cater to the "I don't care if it sets my pants on fire if I put it on my lap or the battery only lasts 15 minutes on a full charge" crowd.
The quad core laptop CPUs are all pretty slow (in terms of clock speed), for heat reasons. You can get dual core ones at higher speeds, which may or may not be better, depending on how much stuff you do that is heavily threaded/highly parallel and can use more than one or two at once effectively. It is finally starting to make a difference for some games, but still not most of them, and I don't know that you can fit a burly enough video card in a laptop yet for it to really matter anyway. Although I also don't really know to what extent, if any, the laptop chips can take advantage of the "turbo" auto-overclocking feature, because I've only really looked at it in a desktop context (where it works great on my i5 750 and easily makes up for its lower base speed in single-threaded stuff), which could make a pretty noticeable difference.