Educational Programing  

What are the television shows that you let your child watch without feeling guilt because they have a good educational value?

For me, I let my son watch a lot of Noggin which calls itself "Preschool on TV." My son really enjoys Yo Gabba Gabba which I think has helped to teach him good manners. He remembers the songs from it and will sing them when he is doing tasks in the house.
He also really likes Dora the Explorer and also Go Diego Go. I like both of these because they help him to get a small grip on Spanish. We live in an area where there are a majority of Hispanic students at their school and it is good for him to have a start on the language when he starts school. The school actually does teach Spanish during the primary years as well.

Of course, I also let him watch some junk, but mostly we stick to the educational channels. I'm just very interested in knowing what other educational programs other parents like.