Scientific laptop fashion?

I must upgrade my computer soon. Meanwhile I keep my eyes open to see what is available and what might be suitable for me. I have even considered a laptop – so am naturally interested in what people are using.

I recently watched the videos of the Origins Symposium. It was great and well worth the time. However, I was a little distracted by the laptops presenters used. As many of the presentations were by panels of five or so people sitting in front of the audience their laptops were often lined up in a row.

Patricia Churchland favours Macs but steven Pinker doesn't!