A very small Vim plugin dealing with the file format I use to record vacation time.
Here's an example of what my PTO files look like:
# 2011
# Smith Rock
11/09/26
11/09/27
11/09/28
# Red Rocks w/ Marty
11/10/24
11/10/25
11/10/26
# 2012
# Red Rocks
12/04/09
12/04/10
# Mazama
12/06/01
# Tuolumne w/ Steve
12/09/04
12/09/05
12/09/06
12/09/07
They're just a list of dates (in YY/MM/DD format) with comments interspersed.
This plugin adds syntax highlighting, filetype detection (for the .pto extension), and a command called PtoTotals that will add up the total vacation days used for each year.