I'm not up on the "netnanny" type software but a recommendation I heard on the news really makes sense.
Don't put the computer your child uses in a room by itself where the child can go and be alone, like a bedroom, etc.
Place it in a room where everybody in the home frequents, living room, etc.
Less problems are likely to occur, chat room predators, web cam pervs, etc if the pc is where you can view it often.
just a thought.
I watched the dateline episodes on msnbc where they solicited sex through yahoo chat posing as 12-13 year olds and was amazed at how many people they actually got to come to the house they set up. Doctors, teacher, marines, computer geeks, etc
It was funny watching them try to lie there way out of why they came to the house to meet a 12 year old.
"I'm here to just warn the girl that she shouldn't be doing stuff like this"
Uhm sir, you sent her pictures of you naked.
"Uhm, must be someone else"
You brought condoms.
"Yeah, but, I , I "
Oh crap
The cops were waiting outside for them 🙂