Citeulike is a free social bookmarking tool for academia. If you haven’t looked at it yet, you should head on over there and check it out. They recently came out with a new feature, recommendations. On your homepage, there is now a “recommendations” section that lists articles that others have bookmarked that you may be interested in reading as well. I’ve found it very accurate and I actually read the majority of the recommendations. What a novel concept, a recommendation engine that works!