B2B marketers looking for ways to turn their Web sites into demand generation tools have some new solutions to consider. Yesterday, Demandbase announced a new software suite to help marketers harvest passive traffic visiting Web sites. As part of a broader lead generation, on-demand platform, Demandbase offers a free, downloadable Web application built on Adobe AIR (one of 3 investors in an $8M round they also announced.) One side of the supply helps firms generate demand — acquire leads in a sales-led “push” model, one that feels more focused on outbound communication.