Well, my 8-year old is a boy, but he's also at that stage w/ TV - and he doesn't watch a lot of TV, loves dinosaurs, and is an avid reader.
Fortunately, he's willing to watch with his little brothers without a fuss, but a few of his recent "big kid" choices are:
Arthur
Liberty's Kids
We also do the "Walking with...." shows (Walking with Dinosaurs, Walking with Prehistoric Beatst, etc.)
At school they watched (I think it's called) "Raz Kids" last year. He liked that. He also still like "Curious George" and "the Cat in the Hat Knows a Lot About That". He can read really well, but thinks "Word World" is hilarious. And though he figures out the clues early on, he enjoys "Busytown Mysteries" and "Super Why".
I have also heard that Word Girl is good. He used to watch "Dirty Jobs" with his Dad.