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Unfortunately, that means you'll have to be a Plus member not just to upload these files but to view them as well. Plus members pay $60 per year or $10 per month — worth it if you're a big fan of the sort of art house fare that makes up Vimeo's niche, not so much if you're not (though according to the top 10 video sites poll we ran recently, a lot of you are).
1080p videos use 1080 horizontal lines to draw the image, as opposed to 720 for 720p, 480p for 480 and so on. More lines mean a sharper image on screens that can handle the resolution.