Saw this today and thought it might make for a cool toy to be able to check if a video card was working or a monitor was on the fritz without cracking a case just by trying to plug th a little monitor like this
http://amamax.stores.yahoo.net/ikv225intftl.html
into a computer. Got picture…monitor is on the fritz, no picture, time to dig into the machine.
Unfortunately it looks like they all use composite video inputs 
are there any out there that use vga or DVI so they can be used on computers.