I was trolling through the Emacs tweets when I saw one entitled “Emacs 25.2 Released” with a link to a video. I thought it was going to be a discussion of the new things in Emacs 25.21 but it turned out to be a video by Arjen Wiersma about his Emacs 25.1 configuration.
You might think I was disappointed by the bait-and-switch2 but I wasn’t. Wiersma steps through many of the most important packages he uses and demonstrates how they work. Although his configuration—with the exception of the Clojure stuff—is pretty much like mine, I did learn a couple of new things. For instance, there is a counsel-imenu command that brings the convenience of swiper to imenu. Similarly, there is a counsel-unicode-char command that makes it really easy to enter Unicode characters if you can come close to their name. I’ve installed both (or, really, just bound key sequences to them) and have already found them useful.
There are lots of other goodies in his configuration, which you can browse here. If you’re looking for a good developer’s configuration, this is an excellent place to start. Wiersma is mostly concerned with Clojure but his setup will work well for any developer. I really recommend that you take a look at it.