If Google's entry into a field of advertising doesn't legitimize it, nothing can. And that's why the in-game advertising industry just got a huge shot in the arm.

On Tuesday night, Google announced the beta launch of its new AdSense for Games program, the search giant's first foray into the video games market, and the long-awaited answer to the question of what the company planned to do with AdScape Media, which it bought for $23 million in February 2007. According to Christian Oestlien, the senior product manager for AdSense for Games, the program's beta launch will focus on the placement of a variety of forms of ads in Flash-based casual games and some larger titles.

In the beginning at least, Oestlien said, Google will work with partners like PlayFish, Mochi Media, Demand Media and Konami. The latter, Oestlien said, would use AdSense for Games to place ads in well-known titles like Frogger and Dance Dance Revolution. And among the initial advertisers participating in the program are eSurance, Sprint, and Sony Pictures Entertainment.