Interesting move on Microsoft's part. They have no plans to acquire nVidia in the immediate future, but since Windows 8 is launching on ARM, I'm going to assume that Microsoft is very interested in nVidia's Tegra ARM technology. Additionally, this prevents Apple, who has had its eye on nVidia for some time, from placing a bid. nVidia is definitely a prize. They're one of only two big players in the graphics processing industry (the other being AMD, which acquired ATi Technologies about 6 years ago) and their mobile technology is already gaining a lot of traction.
I'm not sure if this move will eventually lead to an acquisition, but if it does, this would be a blockbuster deal. Thoughts?