One thing I noticed is that I manually type the most common commands less than expected, because I've moved them to launchers that sit on a panel. So htop, yaourt, and others are much more used than this would indicate, because they don't get executed from a standalone terminal. I also tend to clean out duplicates every now and again from my .bash_history, so this listing on my machine is skewed towards commands I didn't cull yet. But it's an interesting exercise.

(For the curious: yaourt is a package manager [wrapper], and nc is netcat)