From the beginning of the age of mobility, we've been trying to squeeze more computer into smaller, lighter and more mobile notebook cases. A new generation of large notebooks with impressive displays, however, turns that idea on its head.

Forget about those anemic notebooks with tiny screens, cramped keyboards, underpowered processors and minuscule hard drives. Full figured and proud of it, large-screen notebooks are for when a 14-, 15- or even 17-in. screen just isn't big enough. We're talking about an 18-in. or bigger display, a fast processor, multiple hard drives and a TV tuner -- in other words, everything a desktop has to offer, except the desk.

These systems on steroids let you work and play on one system. If you need to justify the excellent DVD and TV capabilities, think instant presentations. You won't waste any time setting up a projector -- just open the massive lid and start the show. With powerful processors, these monster notebooks are also perfect for a variety of heavy data lifting, like video editing in the field, on-site CAD engineering and design work, as well as turning seismic data into underground maps of where oil might be hiding.

Bob O'Donnell, vice president for client and displays at IDC, estimates that notebooks with 18-in. or bigger screens add up to just over half a per cent of the world market today, or something like 750,000 units. By 2012, he thinks that could grow to 1.3 per cent of notebooks sold, or 3.9 million units.

"They're great for their intended uses, but they're not for everyone," O'Donnell warns. On top of weighing about the same as five MacBook Air notebooks, these behemoths are bigger than the typical airline tray table. You'll need a special notebook bag, if not a hand truck, to get from point A to B. Plus, the cheapest one sells for about what four basic notebooks go for.

Then there's electricity. These notebooks use huge AC adapters that suck down three times the power of the typical notebook. Expect to pay up to about US$80 a year to power one of these machines, about four times what the typical notebook requires.

The latest in large-screen notebook technology comes in two sizes. First, there are those with 20.1-in. displays, like Hewlett-Packard's Pavilion HDX and Eurocom's M590KE Emperor-X, both of which weigh more than 15 pounds each. At the other end is the Acer Aspire 8920, a 9-pounder with an 18.4-in. screen.