I'd argue that anybody that plays Mario Galaxy or Zelda: Twilight Princess is easily a hard core gamer as well as the Halo, Killzone 2 or Modern Warfare gamers as well. Just my personal opinion. I'd call the Wii Fit users casual gamers though - which until MW2 was one of the top best-sellers this entire year.
They're maemo and MeeGo... "Meamo!" sounds like what Zorro would say to catherine zeta jones... after she slaps him for looking at her dirtily...