Things are usually pretty clear in my mind, though. I remember the dates of all the big upcoming meetings and mostly can remember what I need to do. I'm usually juggling a few too many things, though, and I still haven't found a way of reliably keeping track of my short and long term to do lists. I think my current system is occasionally dropping reminders into Outlook calendar for the random stuff, like conference abstracts or whatever, and hoping that if I forget anything that's really important, someone will yell at me and I'll do it then.
Electronic files at work are organised despite the chaos of my desk. It's super easy for anyone else to use and my system for that has actually survived the overwhelming workload days.
At home, bills get stuck on the fridge and the due date gets stuck in my mind. I have a calendar stuck up in the kitchen where we write down appointments or invitations to stuff. Occasionally I remember to look at the calendar. We mostly do this so we don't end up with parallel timelines when we both need the car.