Logs are awesome.
Remember Stephen Wolfram?[1]

These are the tools I use to log. :-)


Currently supported:
* E-Mails in maildir format[2]
* Twitter (only the last 3,200 tweets can be downloaded, I'm sorry)
* Music scrobbled to Last.fm
* I'm working on a thing I name 'ping' which is an app on my smartphone
  and a cronjob on my desktop computer and pings a URL every 10 to 15
  minutes to count how often I' am (or, my devices are) online. 

[1] http://blog.stephenwolfram.com/2012/03/the-personal-analytics-of-my-life/
[2] It's actually my GMail account which is downloaded with getmail anyway
for my weekly backups.