I have been working out plans for making an interesting subset of the internet available offline (along with a search engine).
However, I realized that my entire motivation for working offline was that it eliminates distraction. So it would defeat the purpose!
However I'd still much rather be distracted on Wikipedia (or even HN) than other sites (esp. those with primarily images, gifs or video).
I might need to segment it into "tiers", and have more fun parts come "online" as the day progresses...