Do you keep your life list in an actual journal, on the computer, or in your head? [View all]

I am thinking of starting some kind of journal to keep up with all the birds I have seen. I can't think of what would be the best way to organize it to make it easier to find all the species. I had thought of using my Field Guide to Birds, because it is already perfectly organized, but I hate writing in published books. So far, I have just been mentally keeping up with it, but would enjoy it much more if I could put a date, time, and place down somewhere to remember that too. I'm horrible with remembering dates and sometimes even years. I tend to remember eras of my life better than years.

I was just wondering what others do to keep up with all the wonderful species of birds and the times and dates and places where you saw them.