For my son, it was "Johnny Test" and "Phineas and Ferb", the latter being one of the most well-done bits of hacker/maker propaganda I've ever come across. Amusingly, all the scientists/engineers in Johnny Test that aren't creepy villains are girls (Johnny's twin sisters and occasionally friends). My son had no problem looking up to them anyway.

I got a certain amount of crap from others for "letting" him be so into a girl thing, and I remember getting crap as a kid because most of the figures I looked up to are men. Is it hypocritical of me to be both frustrated by the lack of stuff about girl techies and irritated that our society pushes kids to pick such things only from same-gendered examples?