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Bloomberg's sources say that Happy Aquarium is valued at $200 million. That might seem ridiculous, but when you consider that Electronic Arts acquired Playfish last year for $400 million, it just might be true.
CrowdStar is apparently the fourth-largest Facebook developer, so nabbing the company might be very much in Microsoft's interest -- if it does in fact want to enter the social game space. It's unclear if CrowdStar's games would be ported over to the MSN Games portal that Microsoft currently runs, or if the games would be added to Xbox Live.
In any event, the huge success of FarmVille and its estimated $1 billion valuation underscores the enormous potential of this sector, especially in the area of virtual goods.