Well I have to say that I will never understand these doubts about having your children photographed, which I can observe here in the UK... I think that society overall becomes too stressed and to up-tight in many aspects. Naturally, your kids photographs can be used by some perverts. But in exact same way as anyone's photographs could. And, practically speaking, statistical chance of such event occurring is extremely minimal.
Photographing kids in Eastern Europe, where I came from, seems totally natural and acceptable. Because they're fun, cool and lively. No one sees anything wrong in approaching a group of kids playing in the park and taking some pictures of them, of course with parent's permission - but that is usually given without much doubt. Here obtaining such permission isn't even worth trying, in most of the cases. I have been personally called weird names at least dozen of times, when asking parents for taking a few snaps of their kids playing in the park...
Here, in UK we are facing security cameras all the time. In the shop, at work, everywhere. All kids you know were caught on them more than zyllion times already and they will be in the future.
Do not go insane. Care for your kids, but be sensible. This is a thing I'd like to see more, same as people finally realising that we're living in a world where there is nothing like "protected image".
I think that world changes, and we have to change with it or become boring, obsolete and so up-tight that we'll choke with our own limitations...
Just my 5p.
