Digital Impact Inc., KnightRidder.com, LinkShare Corp., 24/7 Media Inc. and 2Roam Inc. have selected iQ.COM, Saratoga, CA, as the engine for their e-Marketing and promotion offerings. Application service provider iQ.com offers marketing campaigns through a distribution network to affiliate and ad networks, ad serving technologies, wireless devices and e-mail. In addition, AdForce Inc. will provide ad serving technology for iQoffers.