Hori's relatively giant 12-inch, 720p LCD docks with your XBox, bringing it half way towards being tote worthy. I especially appreciate the fact that the screen is essentially the same width and length as the console's side.
The Japan-only screen launches in July, and takes component outputs. It costs around $300, nearly as much as an XBox 360, but other screens tend to range in the 7-inch range, coming in low def res, so let's hope this one comes stateside. One more shot, post jump.