Anonymous entrepreneurs who dream of being Silicon Valley superstars need just one thing: Paul Graham's launching pad. From left: Business boot campers Sandy Spicer (Moki.tv), Qasar Younis (TalkBin), John Egan (Sendoid), Jonathan Deutsch (Tumult), Aaron Harris (Tutorspree), Laura Valverde (Beetailer), and Wei Hsu: (Hyperink)Photograph: Robyn Twomey The Y Combinator offices sit at the dead center o