Silverpop, a maker of on-demand software for marketers, has raised $15 million from DFJ and DE Shaw in order to accelerate R&D and to do acquisitions. The Atlanta-based company, which focuses around email marketing, says it’s profitable since 2004, and that it grew revenue by 60 percent in 2007. The company says it’s benefiting from a shift towards web-based software within the industry. CEO Bill Nussey was previously at consulting firm iXL as well as Greylock. Release.