I love desktop linux. I've used it on and off since 2000. Even with Valve's excellent work on gaming, there's still whole software categories that require Windows. Pro audio software is very Windows reliant and I don't see it changing. If you're a software developer, there are many benefits to using and deeply learning linux. But even as a linux super-geek, I don't expect to ditch Windows entirely any time soon.
I love my Libra 2 reader, but I only use it to read epub files from questionable websites. I would pay for books if they were available as DRM-free epubs.