Kiip, the seven month-old mobile startup, is finally coming out of stealth today and revealing an entirely new model for mobile in-game advertising, one that offers users value instead of fighting for their attention. Going beyond the banner and text ads used by industry leaders iAd and AdMob, the team behind Kiip has thought long and hard about the way people actually play games and has come to conclusion that the moments when players experience in-game achievements like upping a level, completing a challenge or accumulating a certain number of points are the most valuable in terms of providing the most user engagement.