Windows 7 On 10% of PC's Worldwide
"Just six months after its release, Windows 7 is now installed on one in 10 of the world's PCs, Microsoft has confirmed. The operating system was launched on 22 October 2009 and has gone on to sell more than 100 million licences - making it the fastest-selling Windows OS in history according to Microsoft."
Pretty impressive, I've seen a lot of IT departments implement this upgrade much faster than they normally put in OS upgrades. I upgraded my Vista machine the first week Windows 7 came out. But, I still have 3 portables running XP. I'd bet there would have been even higher penetration and faster adoption if a better upgrade path had been offered for netbooks.