I'm not sure if I've actually contributed to this topic, and I'm not going to start looking, either. So, I'll put my $.02 in...
I think video games can have a good/bad effect on kids these days. It just depends on what kind of game they buy.
If they buy some violence game, they'll end up saying, or imitating, some of the things that were in that game (punisher, resident evil, etc) when they go to school or wherever. Now, if they were to buy some learning games (The Learning Company, (Treasure Cove, SpellBound, etc) LeapFrog, etc) then, no, there is no bad influence there.
It's the parents that should be the blame for not looking into what type of games they are getting for their kids. Yes, I'm sure they are not 'hip' on todays technology/games, but they need to start studying, or playing to get the feel of what kind of games their son/daughter is intereted in these days, and then they can tell their kids that they need to think more positive on what games they can get for a present/prize.
Perhaps, they need to make a rule or some sort of agreement about when or what they buy. Maybe tell them if they buy a violent game, they need to play more of a learning/fun type of game more. Have the kids play 1-2 hours of the fun game then when they are done with that, have them play 30 minutes (no more than that) of the violent game. I know that still seems they are giving bad influence but it gives them more 'freedom'...I guess... <.<;;