A reddit thread about Emacs configuration has a few tips in it that were new to me. See also popular .emacs files uploaded to dotfiles.org and dotfiles.com (which is different, apparently).
This is BrainLog, a blog by Dan Sanderson. Older entries, from October 1999 through September 2010, are preserved for posterity, but are no longer maintained. See the front page and newer entries.
January 15, 2008