Bleach isn't really a kiddie show...
There's only some anime that have black blood. I think they just wanted to keep it down a notch or for you to buy the uncensored version.
There is also uncensored version for School days final episode.
Here's the final 6 minutes of the uncensored raw one on youtube.
http://www.youtube.com/watch?v=zHw-lm8zu9o&fmt=18