I'd highly recommend Little Brother by Cory Doctorow. I read it last weekend and simply couldn't put it down. It's along the lines of 1984 but less extreme and thus more believable. The (free) ebook can be found at http://www.craphound.com/littlebrother/download/. The author offers the ebook for free and asks that you donate a copy (explained on the site) instead of emailing him and offering to pay him directly for it (or anything of the sort).