For me, the key to organization is folders, folders, folders...and I don't mean the type that were on sale last week...I mean computer folders.
I have accumulated lessons/examples for the past few years...I even used this today to pull questions for a review quiz:
What I need to work on is keeping organized throughout the day, particularly when I have several classes in a row...this is what my desk usually looks like at the end of the day:
In fact, it looked very similar to this yesterday at the end of the day. I had to take a few minutes to reorganize and clean it off before I left for the weekend.