Google has opened up its charity wallet once again. This time, the search giant has donated $2,000,000 to the Wikimedia Foundation, the organization that runs and maintains Wikipedia.

The donation, in true social media fashion, was announced via tweets from Wikipedia Founder Jimmy Wales and Wikimedia Foundation advisory board member Mitch Kapor. Neither Google nor the Wikimedia Foundation have made an official announcement yet — it's supposed to come tomorrow.

The donation's definitely in line with Google's generosity to foundations that promote a faster and more open web. However, we think it's interesting that Google is giving money to the Wikimedia Foundation now, only a year and a half after the search giant launched its own Wikipedia killer, Google Knol.

Back then, we said it was doomed to fail, and so far Knol's stagnation has proven us right. Is this a sign that Google's abandoned the project and is embracing Wikipedia as the web's center for knowledge? Hopefully we'll get some answers tomorrow.