It is both hilarious and interesting to me that this thread is still going.  When I first found it, and saw it started in 2007, I had no hope.  But seeing that it keeps getting revived, I've gotta laugh, and join in.
I have attempted the same as Ice2921.  I cannot get it to work properly on an LCD.  I have a Dell LCD 4:3 monitor with a composite input.  Sometimes I get a B/W display with strange lines, although the games are perfectly visible.  Sometimes I get what looks like a weak signal along with an off-color band going down the left side of the monitor about 1/5 of the way in from the side.  It looks good on the CRT the unit came with, but as we know, the colors are a bit off and it's quite small.  My idea was to convert this into a tabletop as the base was trashed on mine.
I have no serious love for this thing, but 4 dear friends of mine spent way too much on it for me and I want to resurrect it to make them feel better.  I know they paid at least 200 bucks for it.  I didn't have the heart to tell them it was crap.  Only that the base was water damaged and it needed to be rebuilt.
I saw up above that Viewsonix stated the box might just not put out enough juice for another monitor.  Has anyone tried a video amp?  I'd much rather use an LCD, but I do have a source of old flat screen CRTs at work.  I'm going to bring one home to see if the display is better on one of those.  But LCD is definitely desired.