Here is an obviously non-exhaustive list of blogs, which would be of interest for someone working in machine learning:
- Cross Validated: http://stats.stackexchange.com (OK, it is not really blog, but rather a question-and-answer site. The answers, though, are often so good that they could be published as blog posts as well.)
- Machine Learning Theory: http://hunch.net. The average pace is one post per month, very practical, always surprising approaches
- Edwin Chen's Blog: http://blog.echen.me. The average pace is one post per month, covering more applied topics
- Machined Learnings: http://www.machinedlearnings.com. The average pace is one post per month, covering more applied topics
- FlowingData: http://flowingdata.com. The average pace ...