HP Pavilion HDX "Dragon"
Price: about $2500
Availability: Discontinued; check eBay and Amazon
Extreme spec: 20.1-inch screen
Reasons to love it: There are big-screen laptops, and then there are televisions fastened to a clamshell case. At 20.1 inches, this gargantuan PC can double as a mobile DVD player--if you don't mind having 15 pounds of computing power sitting on your lap.
Specs include a 2.6GHz Core 2 Duo Extreme X7800 processor, 4GB RAM, two 160GB hard drives, Wi-Fi, and HDMI and eSATA ports. HP has discontinued the Dragon, so you'll have to scour Amazon, eBay, and online thrift shops to find it.
Though HP had designed the Dragon to compete with Dell's XPS M2010, another 20-inch-screen behemoth, this size of laptop turned out to be a little too crazy for most people.
If more screen space is what you need, keep in mind that manufacturers have been showing off some multiple-screen laptop ideas that may be coming soon, including Asus's Dual-Panel E-reader/Netbook, gScreen's concept with two slide-out 15.4-inch LCD screens, and Intel's Tangent Bay prototype with a regular display plus three OLED touchscreens right above the keyboard.
If you're looking for something more traditional, PC World has reviewed a number of laptops with 16- or 17-inch screens, such as the MacBook Pro, the Alienware M17X, and the Lenovo ThinkPad W700 DS, the last of which has a second 10.6-inch monitor hiding behind its 17-inch main screen.