I can't verify this, but I was told that the lead investor is Peter Thiel / Founders Fund. Seems believable, since it's consistent with his investment thesis.
I believe Microsoft took one round of venture financing, and that VC (Dave Marquardt) is both still quite an active investor (as founder of August Capital) and is also still on Microsoft's Board. See http://en.wikipedia.org/wiki/David_Marquardt for details.
There was a company I can't recall its name, but they took VC funding for one round, retained voting control, built successfull business and then refused to go for another VC round. VC still owns company, but can't exit and founders are happy with the way things are.
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