Picked up a meme from here, may as well spread it around.

~ $ history|awk '{a[$2]++ } END{for(i in a){print a[i] " " i}}'|sort -rn|head
2394 cd
1879 ls
1017 vim
998 sudo
890 bzr
732 ruby
585 rm
538 mv
493 find
412 svn

The only reason vim is so low is because I usually start gvim from my KDE menu. Sudo is in that list because my .bash_history stretches back through my Ubuntu phase almost a year ago. At some point I should probably clean out my history file.