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4:3
I've stuck with 4:3 displays throughout. I just had to say goodbye to my lovely old CRT monitor of ten years' standing (*sniff*), and now have a flat screen monitor with the same format. I can understand the appeal of wider displays if people want to watch films on their computer, or have a workflow that requires them to look at things side by side all the time, but I prefer having a smaller display.
Huawei have a range of 4:3 display laptops now. Document writing heaven!