[The Niles]

Laptops are getting better for gaming all the time. There are already laptops which have GF6800 as their GPU but these are not meant to be taken with you to work, they weigh 5 kilo's or more. They are easily stored however so you can clear a cluttered desk quickly by simply closing you laptop and verticly storing it on a bookcase. Laptops with the X700 (like Swiss has) are already perfectly suited for playing games, even the newest, albeit not at the absolute highest settings for the most modern games. The new ATI X1600Go that is appearing in laptops from early 2006 is 40% better then the X700 it replaces and therefore comparible to the 6600GT on the desktop market. The release of new mobile graphics cards after their more power hungry brethren on the desktop market is getting shorter every generation. This means the graphics hit you take while migrating from desktop to laptop is getting smaller and you will have use of it for longer.

The biggest advantage laptops have over desktops (besides being able to take your computer with you wherever you go) is power consumption. A modern desktop will consume anything up to 500W of power while a laptop of similar (but not same) configuration will use less then half of that. So if you find your electric bill is soaring out of hand and you know your buring the midnight oil on your new "state-of-the-art" gaming rig a high end laptop might be a good investement.
Of course all that comes at a high initial purchase price. Even a medium laptop cost more then a high end desktop and that laptop is not nearly as easily upgraded once bought (as stated the GPU cannot be upgraded at all most of the time). Still a notebook is much more versatile for people on the go and much more environmentally friendly for those who care.

Please don't say laptops are no good for gaming any more.