Today is the day for shell history stats:
mah@spawn:~$ history|awk '!/=/ {a[$2]++ } END{for(i in a){print a[i] " " i}}'|sort -rn|head 107 ssh 55 sudo 27 bzr 18 ls 18 host 17 xrandr 17 ping 16 cd 9 ledger 9 ifconfig
(Modified slightly to skip some ledger lines from when I was doing taxes.) You won’t see most of what I do because it’s all in Emacs.