1) Shel Silverstein's Where the Sidewalk Ends
In the spirit of early exposure, this is one of the pop culture pieces I remember fondly that I've already started sharing with my daughter. The poems are funny and smart, and I think that the rhythm makes them enjoyable even for my three-month-old.
2) Boy Meets World
I love this show more than I should probably admit. I didn't have regular television channels when I was growing up (we only had satellite because we lived in the sticks, and we didn't have access to local channels on it), so I was late discovering Boy Meets World, but once it re-ran on The Disney Channel, I watched and re-watched it. Excitingly, and after a long hiatus, the later seasons are supposed to be coming out on DVD. When they do, I'm going to get the series, and I hope my daughter enjoys it half as much as I do.
3) The City Museum
4. Blue's Clues
This show premiered when my little brother was 9 months old, so I was well aware of the Blue's Clues phenomenon. Even before he could talk, my brother would scream with glee at the end of the mail song. At two, my brother was hospitalized after an appendectomy. I recorded (on VHS, no less) episodes of the show to watch while he recovered, and while I was recording them I fell in love with the show (and it's adorable host, Steve).
The show is smart and fun. It illustrates the value of deductive reasoning, attention to detail, and collaborative thinking. Oh, and it's also crazy cute.