Stumbled on this when his domain was hijacked accidentally due to an anti-botnet operation and his post about it came on HN (check the "Sinkholed" post). Since then I've subscribed to his blog, read the older posts and enjoyed the newer posts too.

He mostly posts about technology and mathematics. The reason why I got hooked to this blog is that they are mostly about offbeat topics that I wouldn't normally come across on my own. So there is something new to learn from every post. And they are very well written with great attention to detail.