i dont know why everyone is complaining about the 20" "not being HD". 720p, which is higher percieved quality than 1080i (and 1080p isnt fully supported yet) can be edited on even the 20", actually even the old 17" 4:3. heck, my powerbook g4 15" at 1280x854 can view 720p HD video with pixels to spare if it wanted to (but i dont have any HD content). 1080p is another story, but chances are that if you're needing to edit 1080i or 1080p content and 720p isnt enough for you, and in that situation, you can probably afford a $5000 HD camera to shoot 1080 content with, and a $3000 powermac g5, then you can probably afford a $1500 23" or two or get a dell. stop complaining. the 20" is a great monitor, and apple isnt going to change the DPI, when 1080i on a 20" monitor wouldn't look that great anyways. sorry, had to rant.
but this is great news about the price drops. the 20" is becoming more and more of a reality for me to afford. and i'd be more than happy with 1680x1050 pixels.