Just found through this post by Technofreak, where a simple(ok, that is not simple), onliner on your terminal will show you the top 10 commands used recently.
$ history | awk '{print $2}' | awk 'BEGIN {FS="|"}{print $1}' | sort | uniq -c | sort -n | tail | sort -nr
This on my system shows up
82 cd
63 ls
51 sudo
51 screen
18 ps
17 irssi
15 python
14 svn
12 irb
11 uptime
