If you're buying a laptop with brand new hardware you may have trouble getting some things like TerryP said such as ACPI/audio/networking running for awhile. I have a two year old ASUS A8 series laptop that just started to come around with the 7.0 Release. That being said it runs amazing now and everything works great.
Similarily as I would say to someone looking for a linux laptop, definitely go for one with Atheros branded wifi and NVIDIA graphics if you want 3D acceleration.
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