This TechCrunch article lets drop that one of Linden Lab's early investors, Catamount Ventures, sold ten percent of their stock to a third party for an undisclosed amount that was valuated at 'above half a billion' dollars, as stated by an anonymous source with knowledge of the company.
What surprises me most about this article, beyond the massive amounts of money being mentioned, are the mostly positive comments after the article. Having seen rather a lot of these go by, I expected a ton of lame duck jokes about the value of Second Life being virtually nothing, etc. but by and large people are taking it seriously. Of course, for me and thousands of others, the true value in SL is its social component. Without that one-to-one connection, there truly is little to value.