Art Cam
    Art related sites, usually
     photography

Beach Cam
    Webcams at beaches around
     the world

Cam babes
    Sites with possible erotic
     content

Family cams
    Family friendly sites

Couple cams
    Couples with a cam

Guy cams
    Personal sites usually
     with BLOG (no nudity)

Radio Cams
    Radio stations broadcasting
     live

Robot cams
    Pan/tilt/zoom, it's up to
     you

Street/city/weather cams
     Cams around the world...