$history|awk '{a[$2]++} END{for(i in a){printf "%5d\t%s\n",a[i],i}}'|sort -rn|head
  105	python
  104	cd
   69	svn
   42	ls
   36	ssh
   25	wget
   18	mate
   12	./keyMetrics.py
   11	cp
   11	./lighttpd

But I've been on the road for a while: http://twitter.com/tipjoy?page=2