Evesham isn't the only vendor going to extreme lengths to make beefy notebooks. Vendors like Alienware and Acer also have given it a go, and more often we're seeing laptops that do amazing tricks like SLI or RAID-0.
Notebooks as replacement desktops is almost the norm these days, with more and more vendors offering a lot of performance tightly compressed into a tiny unit. With the advent of dual and quad core mobile processors and a host of other high-performance equipment being feasible for a mobile, the only setback now is price. You can read more about the NX600 at their site.