Lenovo ThinkPad Series
ThinkPad laptops have long been favored by business men and women, since back when they were made by IBM. Now that Lenovo has the line, they've kept up the good work by providing strong, durable notebooks that have plenty of power under the hood. The ThinkPad laptops can be equipped with Core 2 Duo processors.
Sony VAIO Z-Series
The Sony Z-Series laptops mix sumptuous style with strength and power. They're packed in heavy-duty carbon fiber and aluminum bodies, resistant to damage from drops or bumps. They also feature a unique "G-Sensor," which can tell when the laptop is falling. It locks the hard drive so it will not get damaged or lose important data.
Panasonic Toughbook Series
The Panasonic Toughbook laptop computers are intended for users who'll be venturing into harsh conditions like a construction site or any other scenario that would otherwise destroy a typical laptop. Encased in a thick magnesium alloy shell, the Toughbooks are very resistant and very strong. There's almost nothing you could do to this laptop that would endanger your data.
Apple MacBook Series
Apple's MacBook computers (the standard MacBook, MacBook Pro, and MacBook Air) are remarkably light and thin, making them a great choice for travel. They're also very powerful, with lots of excellent features that will make your work on the road a lot more pleasant. The Air in particular is extraordinarily thin, thin enough to fit in a manila envelope.