I just got a Samsung RF711 and it's great for music production. Core i7, 8GB RAM, room for a second internal drive, two USB 3.0, ports and two USB 2.0 ports, an HDMI out for an external monitor, and a 17" high def screen. Best part is this puppy is around $1000 street price.
Two advantages to recording on a laptop, as opposed to a desktop.
1.) Mobility! this is a huge deal for me. The drums are in the basement, but most of my other equipment is in my office. I need to record in two different places. Plus I can take my rig over to my brother's house to record his band if need be.
2.) Practically Noise Free! Fan noise sucks on most all desktop units. They are designed to suck alot of air through. Laptops have fans, but most of their cooling is from passive dissipation to the laptop case. So no worries about getting your powersuppy fan noise picking up in your mics. Now if you have a true booth setup, this may not be an issue for you. For those of us who have to improvise, this is HUGE!