I have heard that children 2 and under should not watch television. However,
I believe that if the program is educational and stimulating the child's
senses, then let the child watch a little television.
Sure if a parent is putting his/her child in front of the television for
hours, I can see how that would be detrimental to the development of the
child.
Yet, shows like "Blues Clues," as you mentioned are interactive and colorful.
I have a 3 month old daughter. She loves to look at the bright colors on the
television, and only watches it when I need to do something around the house.
The television, in a way, helps her learn to sit still and concentrate.
Therefore, I don't see that could hurt her a bit.
KBaker