I use this script to log everything I do throughout the day

log

#!/usr/bin/env python

# myLogger.py by bill@wellingtonnet.net - 2012-11-14
# This module takes additional commandline arguments, concatenates them into a
# string, and then appends that string to a defined output file.
# 
# Intended to be an easy to access work log for all things that I have completed
#

# import necessary modules
import sys
import os
import datetime


# main() function
def main():
  now = datetime.datetime.now()

  tmp = ' '.join(sys.argv[1:])

  outfile = '/Users/bwelling/Dropbox/scripts/myLogger/output/done.log'
  
  outstr = now.strftime("%Y-%m-%d %H:%M:%S") + ' - ' + tmp + '\n'
  
  f=open(outfile,'a')
  f.write(outstr)
  f.close()
  
  # print sys.argv[0:1]
  print 'Adding ' + outstr

# Call main()
if __name__ == '__main__':
  main()