WildTangent has a new ad platform for sponsoring in-game virtual goods transactions in online games.  Adweek reports that the casual game maker has launched BrandBoost, an ad platform for online games that enables advertisers to sponsor, and in turn subsidize virtual items acquired by players.  The news outlet says BrandBoost is already in use by Sony Online’s Free Realms games as well as on casual game sites Outsparks.com and OMGPOP.com.  The system lets players shopping for virtual in-game items choose between paying for it or getting it for free by engaging with a sponsor message, such as a video ad.  WildTangent’s Dave Madden called the platform the most effective in-game ad model.   He said that the company will announce a BrandBoost deal with a major social gaming company in the coming weeks.  Read more at Adweek {link no longer active}.