I can be swayed a bit on netbooks due to some design considerations needed. However, if m-learning is defined by the design approach not the device, then laptops are off my list.
Here is the list from the Don't Waste Your Time...poll:
Thanks Don't Waste Your Time.. for this comprehensive list. Myself, I cannot think of any devices to add, but if anyone out there does, please feel free to comment. And take the poll too.