Hi Yeti:
Your questions is a good one. I also think that it is getting more and more difficult to organize my worksheets and I would also like to know how other people organize their worksheets. I put mine according to level and subject. For example, if I get a worksheet concerning for and since I place it in Level 6 - Present Perfect - For and Since.
As for the worksheets that I use quite often, I place a copy of them in my filing cabinet with part of the eslprintable number, as well as subject and level. When I need to make a change or need it for a class I can find it by doing a search in my computer with the eslprintable number, or I have a copy on hand in my filing cabinet.
Help...it�s getting harder and hader, your suggestions would be greatly appreciated.
Giovanni.