Respond with personalised comments rather than a generic Thank You. Fostering a conversation helps build the credibility of your blog!
Given that your blog has great content, it should also be presented in an organized way. Link within, smart layer are some must have widgets for the same.
Don't just type, talk to your audience. Blogging is way big a market on internet and people will like you if you do more than just providing information. Suggest, express, appreciate, criticize and have an opinion to build a relativity to a like minded audience. Make them feel that their visit to your blog matters to you.