A recent study in Japan of Japanese otaku found five types of otaku:
Type 1: The family-oriented otaku. (Place me here!)
Type 2: The "leaving my own mark on the world" otaku.
Type 3: The media-sensitive multiple interest otaku.
Type 4: The outgoing and assertive otaku.
Type 5: The fan magazine-obsessed otaku.
I would wonder how well these categories translate to those otaku here in the States.
Otaku odds and ends...
Moe - Wikipedia - relates to fans and anime characters.
Meganekko - Wikipedia - eyeglass wearing girls in anime and manga. (For more on how eyeglass wearing is seen as an attractive characteristic in Japan--see Mari's fascinating diary post Eyeglasses fetish
The ultimate otaku story? That may well be Densha Otoko (Train Man). A possibly true story of a Japanese otaku who stands up and defends a beautiful passenger on a commuter train who is being harassed by a drunkard. Ultimately they begin dating, dispite his "geekiness" and her almost unapproachable beauty.