Second Life just open-sourced their client browser. I agree with them that this move was inevitable (and smart), and I think it will lead to accelerating adoption as well as linkages of Second Life to 2D Web, "real-life" experiences (like MySpace, Facebook, LinkedIn, Yelp, Google Checkout, and the many others). We are already seeing many linkages to social networking profiles via ProfileLinker and others.
Again, Second Life may not be the 3D Web to survive – it is very early in the adoption curve and it all depends on their execution (the good, old basics of business). But this move should be the spark needed to fuel further interest in the 3D Web as the next-generation medium for shopping, browsing, and socially connecting. Just look at what happened with FireFox, based on the open-source Mozilla Project. It now represents over 4.5% of all Web browsers in use. That may seem like a small number, but remember how many people are online now (over 1 billion). And don't count the market-share leader, Microsoft, out in adopting the 3D Web.

