Reddit’s up-arrow/down-arrow system with the selected arrow highlighted is much more intuitive and easier to see at a glance than a “vote up” and “vote down” with the selected link in bold. It also makes sense to have the point count next to the vote buttons. I spent my first few seconds on this site wondering why there was only a “vote down” button before I realized the minus sign next to the point count had nothing to do with voting.
I agree with the people saying show the number of comments on the front page.
The most important thing I learned from Overcoming Bias was to stop viewing the human mind as a blank slate, ideally a blank slate, an approximation to a blank slate, or anything with properties even slightly resembling blankness or slateness. The rest is just commentary—admittedly very, very good commentary.
The posts I associate with this are everything on evolutionary psychology such as Godshatter (second most important thing I learned: study evolutionary psychology!), the free will series, the “ghost in the machine” and “ideal philosopher of perfect emptiness” series, and the Mind Projection Fallacy.