tail -f development.log

$ history 1000 | \
awk '{a[$2]++}END{for(i in a){print a[i] " " i}}' | \
sort -rn | head

123 git
80 ruby
71 gs
43 cls
20 git-wtf
18 ll
17 rake
17 gba
16 cd
12 vim

I guess you can say I took the git plunge whole-heartedly. The gs, gba, and git-wtf commands are all git aliases or scripts (git status, git branch -a, and a git branch commit analyzer).