For anybody looking to overdose on CS topics, you might also enjoy: http://www.reddit.com/r/compsci/ and http://www.reddit.com/r/compscipapers Also, http://machinelearning.reddit.com and http://semanticweb.reddit.com feature some high quality links and discussion that many HN'ers might find of interest.
My favorite subreddits are http://www.reddit.com/r/reverseengineering and http://www.reddit.com/r/types .