Being one of TV's all time favorite moms has kept Barbara Billingsley busy over the years. After playing June Cleaver on "Leave It to Beaver," Billingsley went into semi-retirement, opting to concentrate on raising her two sons and traveling with her husband. In the early '80s, a resurgence in "Beaver" nostalgia brought Billingsley back to acting and special appearances. Aside from the 1997 big-screen "Beaver" and various reunions, she's guested on "Murphy Brown," "Roseanne," and just about every tribute to TV moms ever made.