One thing I do electronically instead of in a Filofax is my monthly/weekly work calendar. Like many people, I'm obliged to use a shared work calendar so we can all see (and schedule around) each other's appointments. Outlook, Google Calendar, and similar electronic calendars excel at that.
Here's one thing they're not great at: Getting an overview of the full year, with timelines for vacations and conferences. I'm going to try a Filofax fold-out Year Planner to get a yearly overview.
Do you use year planners? What's your tool for the big picture?
Of course, since it's Friday, all ring organizer discussion is welcome!