I use goodreads and the books subreddit mainly, they have all sorts of lists of recommended books (just avoid the ones infested by Twilight moms), and just save books that sound interesting to my todo list. When I need a new book, I just go through it and pick out whatever sounds interesting.
On that note, I finished 50 Shades of Grey and got about 1/4 of the way through American Gods today. 50 Shades would have been hilariously bad if it was half the length, but it really dragged at the end. Still, it was definitely in the spectrum of 'so bad it's good', and it actually ended really unexpectedly.
American Gods is the first Gaiman book I've read, and so far it's pretty much exactly what I expected - awesome. Still not sure where it's going, and I'm not entirely sure how I feel about Shadow as a main character, but it's still excellent.