Here is Android x86, an open source project which allows you to put Google's Android OS on PC hardware. While there is some software that won't work, it's surprisingly capable! While obviously best for netbooks it's capable of running on many laptops, or you could consider running it in a virtual machine if you just want to run Android software on your PC for a bit. Here's the download page (the proper boot media can be found under "Android-x86-4.4") and installation instructions.
Some early reviews of Windows 8: "The worst computing experience I've ever had." "A technological, ideological and functional failure." "I’ve felt almost totally at sea — confused, paralyzed, angry, and ultimately resigned to the pain of having to alter the way I do most of my work." (previously) [more inside]
Self-proclaimed "avid, loyal Windows user" and PC World editor Tony Bradley spent 30 days immersing himself in Ubuntu Linux, and chronicled his experiences as a Linux newbie. His previous project: 30 Days with Google Docs (Via: 1, 2)
"Today, at the D9 Conference, we demonstrated the next generation of Windows". Previewing "Windows 8" [more inside]