"Blog carnivals" are collections of similar-topic blog posts usually hosted every week or two on different sites. There are lots of special interest carnivals, and probably several that will tickle anyone's fancy. The carnivals tend to feature the best of what's out there. I'm too busy to host one, but I've submitted to several.
Geek Counterpoint recently hosted the Philosophia Naturalis carnival #3: a collection of blogs entries about physical science and technology. The host kindly included my Plowing Through the Electromagnetic Spectrum essay from the other day, and there are lots of excellent things to read there. Check it out!