[shakna]

I have a cheap startup task in cron that greps my todo files (generally one per project, and an everyday one) for any scheduled tasks and adds them to my calendar. Which syncs across devices.

If I modify times then the calendar events get killed and reinserted. (Diff checks for changed todos for me)

Finally, the feedback loop gets closed by email. I can send an email with a task, and it gets pulled down to insert or modify todos.