The newest book suggestion program I've heard about is Curated Fantasy Books / Curated Science Fiction (they've done some other genres as well).
Here's a little about them:
Here at CuratedFantasyBooks.com, we suggest only the best fantasy books, selected by a human curator, and organized by specific fantasy category. Unlike many sites on the web, we can’t be gamed and we can’t be bought. Imagine entering the world’s best fantasy bookstore, with table after table filled with great suggestions. Find the books that you will really love reading.Another site that's still in Beta is Book Browsr. Again, the point with this site is personal recommendations. A bit about them:
The recommendations come from book buyers and avid book readers. These people’s jobs and passion are to read books and choose the very best.
So yes, the recommendations are good. And they will get better and better as you interact with Bookbrowsr and your favorite recommenders.
And one that was suggested to me by the folks at SF Signal for helping with the New Author Spotlight posts, What should I read next? You type the title/author/ISBN into the database and see what pops up.
I have to admit, I don't
*Edited to add* Personally I haven't found these types of sites to be very accurate in terms of finding books that I'd enjoy. "You should read this" types of endorsements don't take into consideration different likes/dislikes, and so can miss the mark easily. I liked Battle Royale, but I know it's not a book everyone should read. If my review consisted of, "it's a totally awesome book that'll make you think", I'd be accurate but readers who don't like excessive violence would feel misled reading the book based on that recommendation.
Do you find sites like these useful? Where do you find your next book?