How big will flat-panel computer screens get? The sky's the limit, if the likes of Samsung have anything to say about it. The Korean manufacturer just joined Dell, Apple and others in introducing a 30 -inch monitor. (Model CX305T, for those keeping score.) Akihabara News gives the granular details: "a 2,560-by-1,600 resolution, a 1000:1 ratio for contrast, a 400cd/m2 brightness, and a 6ms response time." But what we care about is the price--about $1,657, by our calculation. Which means we'll be content to squint at our 19-incher for the time being.