I downloaded the D&D cartoon a little while back. Haven't gotten to watch it much because my son (2 years old) doesn't find it as interesting as the X-Men cartoon was (got that one on DVD).
Watching it, though, I'm constantly reminded that my RPG world creation often suffers from too many mundane pseudo-historical locations, and not enough weird gonzo locations like the River that Flows Upside Down or the Forest of Know Trees, not to mention cool locations like the Hall of Bones or Dragon's Graveyard.
It's hard to get a good balance of mundane and crazy that doesn't devolve into silliness. Or at least I worry about the setting starting to seem silly. Well, maybe once my son's a few years older I'll be able to finally let go and embrace the silliness as he starts to play.