It's silly, but I wish the HD aspect ratio had been the golden ratio. There's something very satisfying about it, even if its properties would be of little practical use. (Though I wouldn't have minded the extra vertical space!)
MacBooks have always been 16:10. And recently, 16:10 appears to be making a resurgence once again—many notebook models that were 16:9 1080p have moved to WQXGA 2560 × 1600.