Many of this year's hottest new laptops are all about one word: Ultrabooks.
The term Ultrabook is actually pure marketing, dreamt up by Intel for a new generation of portable PCs featuring its technology.
Like Centrino but unlike Viiv, it's starting to stick as a catch-all term for thin and light laptops, or ultraportables as they're sometimes classified.
The best way to think of an Ultrabook is a MacBook Air that isn't made by Apple, a netbook that isn't underpowered or a laptop that's been on a crash diet. Ultrabooks all feature a Core i3, i5 or i7 processor, plus fast SSD storage and USB 3.0 connectivity.
Check out our video guide to the Ultrabooks that are set to hit the shelves during 2012.
According to Intel, Ultrabooks also have "ultra-capabilities" - security features, battery power, instant-on and quick standby. They'll provide a lightweight alternative to tablet devices for people who just can't work without a full QWERTY keyboard.
Intel has announced a massive $300m (£185m) fund to help develop Ultrabook hardware and software, and it's confident that Ultrabooks will make up 40% of the market by 2012.
The first models are shipping with current generation Sandy Bridge Core processors, which will be replaced this year by a new generation of Ivy Bridge chips.
Intel set an initial price target of $999/£999 for Ultrabooks, though many have been more expensive - expect serious in-roads on the cheaper £600-£800 market this year.
But what's the best Ultrabook to buy? Check out the best Ultrabooks we've reviewed, as well as those we've got hands on with.
1. LG Z330 and Z430 Super Ultrabooks
Rather than a tapered design, the chassis on the 13.3-inch LG Z330 Super Ultrabook is 14.7mm thick from front to back. It runs Windows 7 (for now) and has a bigger brother, the LG Z430, which comes with a 14-inch display. Why is it 'Super'? Because LG says so.
Read our Hands on: LG Z330 and Z430 Super Ultrabook review
2. Asus Zenbook UX31
Asus has done a terrific job with the Zenbook's design - even if you have to acknowledge that the designer took more than a sneaky glance at Apple's ultraportable first.The 13-inch Zenbook is fantastic to look at. When closed, the wedge-shaped laptop measures 17mm at its thickest point and a mere 3mm at its thinnest.The same design thinking even stretches to the Intel Core and Windows 7 stickers. We wonder who it was that proposed they were silver and black - Intel? Asus? - but whoever did has made a difference.
Read our Asus Zenbook UX31 review
3. Samsung Series 5 Ultra
Packing an Intel Core i5 processor, the Samsung Series 5 Ultra is small but perfectly formed. Available in 14-inch or 13-inch models, the 13 incher is 17.6mm at its fattest point, narrowing to 14mm.
It comes with a 128GB/256GB SSD or a 500GB hard drive (alongside a small 16GB flash drive) and incorporates an LED SuperBright screen. The only worry? Battery life is low at around three hours in our tests. Not to be confused with the Samsung Series 5 Chromebook. Which is definitely not an Ultrabook.
Read our Samsung Series 5 Ultra review
4. Samsung Series 9
While the original Series 9 was one of the world's thinnest laptops, the new Samsung 9 Series Ultrabook is even thinner.
The design team has shaved off another 4mm, giving this 13-inch (1600 x 1200) laptop a waistline of only 12.9mm. Inside, a 1.7GHz Core i7 chip does all the hard work, ably assisted by up to 8GB of memory and SSD storage.
Read our Samsung 9 Series review
5. HP Folio 13
As the moniker suggests, the HP Folio 13 is yet another 13-inch Ultrabook. It's not much of a looker and, at 18mm around the middle, it's not the slimmest Ultrabook at CES.
But HP is claiming a 9-hour battery life for the Folio 13, which will be ideal for regular mobile workers who value staying power over pretty design.
Read our HP Folio 13 review
6. Lenovo IdeaPad U300S
Lenovo hasn't obsessed over aesthetics, and this laptop is no Apple MacBook Air clone. It seems chunky next to the wafer-thin Asus Zenbook, which features a wedge-shaped design that tapers off to a thin, blade-like point.
The Lenovo IdeaPad U300S retains its 16mm thickness across the chassis, giving it the impression of being squat. The body is aluminium, and weighs 1.4kg, the same as the Acer Aspire S3, but much heavier than the Toshiba Portege Z830 and the Toshiba Satellite Z830-10U. If you're looking for an ultrabook that will turn heads, you will most likely look elsewhere, but can the Lenovo IdeaPad U300S impress with power?
Read our Lenovo IdeaPad U300S review
7. HP Envy 14 Spectre
The HP Envy 14 Spectre is a little bigger than your average Ultrabook and a little fatter because of it. Intel specifies a sub- 18mm chassis for 13-inch models, but 14-inchers like this can bulk up to 21mm.
With a Core i5 (or i7) processor and 128GB HDD inside, HP claims a 9 hour battery life for the Spectre. And... that's really the only appeal.
Read our: HP Envy 14 Spectre review
8. Dell XPS 13
The Dell XPS 13 might be a little late to the Ultrabook party, but it's one of the prettiest portables we've seen.
Amazingly, Dell has squeezed an Intel Core i5 or i7 inside the trim chassis, along with 4GB of memory and a 128/256GB SSD. How thin is it? 6mm at its slimmest point.
Read our Dell XPS 13 review
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