Spammers beware--hostile amphibians are once again rising against you. First there was Blue Frog, a community antispam effort that stopped operating last week after Blue Security, the company that started the project, came under a withering denial-of-service attack. Out of the ashes comes Black Frog, part of a project that is apparently willing to become a flag bearer in the fight against spam. The project, dubbed Okopipi, is developing the Black Frog antispam software as an open-source project, according to the group's wiki. "This project aims to become a distributed replacement of antispam software Blue Frog," the Okopipi wiki states....