How any network official can buy this show season after season is beyond me. I suspect someone has a warped sense of humour. This show is supposedly aimed at four year-olds but what the show's producers and writers apparently fail to realise is that four year-old kids see Caillou as a role model and they copy him. This had the effect of turning my daughter from a very well-adjusted 4 year-old into an annoying brat. After I saw my daughter laying on the floor kicking her legs and yelling in a scene from the Caillou intro I knew that this show had to be locked. After I blocked this show she turned back into the little angel we're used to having around the house.
Caillou is TV's most annoying brat. He is a dangerous influence on kids and I believe he shouldn't even be on the TV. The show's only use would be as a cautionary tale for parents who have an even whinier kid of their own, but personally I don't see how that would be possible. Actually if the show's only flaw was that it's main character was whiny it might serve some positive function, but sadly not only is the show's star whiny, he's not exactly the brightest 4 year-old on the planet either. He has the intellectual capacity of a particularly slow three year-old. His parents aren't all that bright either.
Altogether I think the best possible thing to do with this show is to cancel it ASAP and try our best to forget it. I prefer Barney to Caillou - at least Barney's annoying sickly sweetness is not something that actually makes our kids worse-behaved. Even Boohbah is better than Caillou - I mean Boohbah is a series that looks like it was made by people high on some sort of heavy duty psychedelic drug, but even so it sends a less disturbing message than Caillou.