I’d already discovered the reader feature, and had started following several blogs but had not noticed the feature for searching for posts on specific topics.
I added a couple of blogs to my reader:
Shady Character, about gardening in a community garden. He’s posted photos of really cool structure in his community garden: http://shadycharacter.wordpress.com/
Thought and awe: interesting science nerd (fyi: nerd is a positive word in my world) and public health posts: http://thoughtandawe.wordpress.com/