In the March Genii, Roberto Giobbi presents a practical and quite versatile method for keeping a list of your current performing repertoire at hand. As I've become older, and both my repertoire has grown as my memory has faded, I've found such tools to be of great value. Especially if someone keeps insisting "one more trick" and you are trying to think of it, or you've just finished performing for some drop dead beauty, and later you think, "Damn! Why didn't I do ___; it's my best trick."
Myself, I've done such things as write my list of favorites inside the flap of a card box. But I go through too many boxes, so I now keep a more extensive list inside my check book. It's there if I need it.
Michael Ammar, in one of his videos, posed the idea of learning card tricks in little sets of 3 or so, which is also easier on the memory.
What of the rest of you? Any cool ideas for keeping your repertoire at your finger tips? I've yet to invest in a Palm Pilot.