Reports are that Google has invested between $100- $200 million in Zynga. This money is a prelude to a larger partnership between the search engine giant and the social gaming company.

Zynga will apparently be the cornerstone of a newly launched Google Games later in 2010. This could mean that Google Checkout could replace PayPal as Zynga’s primary pay option.

Zynga expects revenue for the first half of 2010 to be $350 million, half of which is operating profit. Zynga is estimating roughly $1.0 billion in revenue in 2011, according to sources.

Source: Tech Crunch