I'm not sure if I'm unique here. I track approximately every half hour of time I'm working in Google calendar. This fits nicely with other scheduled meetings. I usually just copy paste jira ticket number + title. At the end of the day, this helps me quickly total the number of hours spent on each ticket to enter into jira. For actual Todo items that aren't in jira, I use my email inbox. I do something very similar to something I saw posted on HN a few days ago called 'zeroinbox'.
