ANDREW CUNANAN'S death kicked online rumorazzi into high gear. Conspiracy Nation (www.shout.net/ ~bigred/cn.html) suggests that Versace was killed by the mob. Others say Cunanan faked his death. A psychic (www.psicop.com) claims to have photos of the killer's corpse. And someone on alt.collecting.autographs says he's got two Cunanan signatures: on an order form and on a credit-card slip. Bidding starts at $15,000.