Sony VAIO PCG-X505/P

And let's not forget that performance isn't all about speed. The 1GHz Ultra Low Voltage Pentium M might not be the fastest chip in the world, but with the mains cable unplugged it can drop its core voltage to just below 1V with Intel's Enhanced SpeedStep technology, and this means really long battery life. In fact, even though the X505 only comes with a basic 2,000mAh battery in its spine, the X505 still lasted for over three hours in our light-use battery test - more than enough for a decent train journey.

This isn't all down to the low-power processor though; Sony has also saved some energy by going for a smaller 10.4in TFT screen, which looks a bit undersized with a 23mm bezel on either side. But it's still adequate for the 1,024 x 768 resolution, and it's also surprisingly bright, with great viewing angles if you tilt it all the way back on your lap.

Of course, there are always compromises when going for an ultra portable, but the X505 makes up for them with its superb design and build quality. The solid nickel fibre lid (the Japanese model's original nickel carbon chassis goes against EU safety regulations) not only looks great, but will protect the screen and insides when travelling too. Our only complaint is that it doesn't clip shut, but there's a tight carry-case for when you're out on the road anyway.

To top it all off, it just looks fantastic. Everything from the glowing green rings on the mains cable and power button to the smart black lid and amazing keyboard make the X505 a masterpiece of design. And this is what you're paying for here. IBM's ThinkPad X40 (see opposite) is more practical, but ifyou want the smallest subnotebook there is, buy the X505.

Author: Ben Hardwidge