Bozhidar Batsov has started a new blog, Emacs Redux, that is dedicated to tips and techniques to make the Emacs experience more productive and enjoyable. So far, I like what I see.
One of the tips from the first day of the blog is how to mark variables and functions void. This is something I often want to do when I'm experimenting with some Elisp and want to get rid of it when I'm done so that it doesn't take up space. (I know, I know, I'm OCD but remember that I come from the time when EMACS == Eventually Mallocs All of Core Storage still had traction.) You do that with
fmakunbound as Batsov explains here.
If you're an Emacs user you should give this blog a look. I'm looking forward to reading future posts. As far as I can see, he doesn't have RSS set up yet but I'm hoping that happens—I wouldn't want to miss out on any tips.
Afterword: I was able to subscribe the blog to Reeder, my RSS reader, by just specifying
http://emacsredux.com. Users of other RSS readers report having to add
http://emacsredux.com/atom.xml to get it to work.