Kirkland, Wash.--ImageX.com Inc. said late Friday that it had signed a marketing alliance with MarketingCentral to sell each other's wares. The move means MarketingCentral, a site that specializes in information for employees of marketing departments and creative design shops, will link throughout its site to the printing purchasing area of ImageX.com. Also, MarketingCentral will have access to ImageX.com's graphic-arts portal, dubbed Creativepro.com. The deal indicates that ImageX.com, Kirkland, Wash., will focus on providing Internet-based e-commerce services, while partnering with key content sites to draw traffic. The site, which joins the fragmented printing industry with the equally fragmented graphic-arts community, is generally considered one of the fastest growing b-to-b exchanges on the Internet.