I am lucky enough to be a stay-at-home-mom, which allows me to work with James on his alphabet, shapes, colors, etc. But some of the shows that he watches really help to reinforce the things we teach him, which I find awesome. Thanks to "Team Umizoomi" he has more easily learned the different shapes and numbers (and not just 1-10). It's even introducing him to addition, which I believe he's starting to pick up a little. In the "Mickey Mouse Clubhouse" episode shown below, they were teaching 3-D shapes like, cubes and pyramids and to my surprise he could name all of them!
I know it's better to just teach him these things and reinforce them myself, but let's be honest, unless I have a whole staff to manage my household that just isn't realistic. So mothers if you allow your child to watch television, don't fret over it. As long as you use educational programming (and there's TONS out there) they will be fine. I have a sneaking suspicion that those "professionals" that write all of those articles against allowing your children to watch TV, either don't have children or have significant amounts of money for a nanny to keep them preoccupied.