I try to stay organized both at home and at work. I don't know that I have just one favorite organizational tool so I am going with one of my new favorites and a tried and true favorite I have been relying on for years.
As I have mentioned about a million times my husband and I live in a fairly small condo so space is at a premium. With the amount of make up and hair products I have and my husbands devotion to Costco it is fair to say there is not a lot of extra space in our bathroom. We have no storage other than under our sink so we have to make the most of it.
Instead of trying to jam things into our one cabinet we invested in some under sink drawers to maximize our space. We did this about 6 months ago and it has actually worked out really well. It has pretty much doubled the under sink storage and the tall things (like hairspray) that don't fit in the drawers fit in-between.
Another way I stay organized is list making. I am a huge list maker both at home and at work and always have been. I love crossing thing off my list so much that sometimes I even write things I have already done for the day on the list just so I can cross them off.
I have one notebook at home and one at work that is pretty much only devoted to my to do list for the week. I try to make my to do list at home either on Friday night or Saturday morning so I know what needs to be done for the weekend. My work to do list sometimes is for a whole week but recently with my new position I have so many little projects going on that I end up making at least a couple a week to make sure nothing falls through the cracks.
In addition to making lists I have a calendar at home and at work that I write things down on. My work meetings are on an electronic calendar but work deadlines are on my paper calendar. I just like being able to look at my whole week and see all the approaching deadlines in various colors.
I am sometimes not as organized as I would like to be but I try to find a good balance.