If anyone can make usable laptops impossibly small, it's Sony.
The TZ21WN is the latest in a long line of ultraportable machines that are tiny enough to carry around with you nearly everywhere you go, yet big enough to do some proper work on without squinting or wishing you didn't have sausages for fingers, although it will set you back around £1,600.
The TZ21WN may only be equipped with a 1.06GHz Intel Core 2 Duo U7500 processor, but it makes the most of what it's got. When combined with its 2GB of RAM, it turned in a PCMark05 performance score of 1,877 which is impressive for something this size and weight.
Where it really shines, however, is battery life -- this is a machine that just keeps going even when it's being pounded by Battery Eater's intensive test. It managed to last a whopping three hours 25 minutes before giving up. The less strenuous reader test proved hardly a match for it and it kept going for a staggering five hours 35 minutes.
The 11.1-inch screen features a carbon fibre lid to protect it from damage, which is just as well as it's impossibly slim at just 4mm. The glossy X-black LED screen is a joy to use, provided there aren't any bright lights behind you to reflect in the display.
The keyboard is great to type on, despite the fact it's been squeezed into such a small chassis. There's even a fairly large 3mm gap between keys, which cuts down on mistypes. The touchpad is a decent distance from the spacebar, so you're unlikely to accidentally activate it while typing.