Same thing happened to my 60gt30. After figuring out it would cost more to get fixed than buy a new one, I sold it on our local online classifieds for next to nothing. Called insurance company, but that sort of thing isn't covered. Extended warranties purchased from the retailers don't cover it either. I tried all the options. Made me physically sick to my stomach to sell my 6 week old panny plasma for $150. But, Its better than just throwing it away.
I have looked into these screen cover producst made from some heavy duty acrylic that they say won't alter the quality of the picture. It sits right on the front of the screen and protects it. The videos I've seen shows the screen protectors take some really hard hits with not even a scratch. My 2 boys are crazy so I know what it's like. Maybe look into that of its going to be in a room where kids will be playing.
Some people will get on here and say "my kids know better than to go near daddy's stuff". But really? My kids know that too but accidents happen so all we can do is chalk it up as a lesson learned. I truly am sorry because that just plain sucks. Good luck.