I actually tried this when I was first testing the TV22. I couldn't find any analogue sources other than my old Xbox.
At that stage I was getting sound-on-vision interference on the set. Definately adds another dimenion to shooting games when the gunshots break up the picture!
I might try the PS3 suggestion (assuming I can remember where mine is
). I also ended up ordering one of the VGA adapters as I think this could be really handy for vintage TVs.
Liam