Yahoo has indeed axed its San Francisco-to-Sunnyvale shuttles, a tipster tells us, confirming a longstanding rumor. Ah, but here's the twist: Yahoo has replaced earth-friendly biodiesel buses from Compass Transportation with vehicles from Bauer's Limo. No one told Yahoo's purchasing department that today is Earth day. Bauer's also supplies Google with shuttles, but according to our tipster, Yahoo is getting the dregs of its fleet: