This started out as a list of top Computer Science blogs, but it more closely resembles a set: the order is irrelevant and there are no duplicate elements; membership of this set of blogs satisfies all of the following conditions:

they are written by computer scientists and focus on computer science research; they are of consistently high quality; I regularly read them.

N.B. I have deliberately excluded blogs primarily focusing on computer science education (for another time).

Clearly this set is incomplete — please post your computer science research blog recommendations in the comments below; I’d be particularly interested in blogs covering compilers, concurrency and computer architectures.