http://www.brightscreen.com/lcdviewer.html
http://www.bargain-camera.com …NaD6sjt3JUCFRIcawodSANYWg
http://www.digitalfoci.com/picture_porter_elite.html
There are tons of the screens out there and I've thought about this myself for quite some time. While I would not use any of these (in this price range) for critical focus and color I would use them in low light areas to check on composition and the like.
I tried the sony DVD player and found the color on the screen so saturated that I took it back.
If I continue to shoot in mines and the like I'll go for a really nice screen that I can also use with my GL2.