I use a Palm PDA. Sometimes an alarm with a message is what I use. Sometimes I use a program I added to the Palm which not only lets me create and retrieve checklists, the checklists get shorter as I do each thing and tap on it. Then, when I need to use the list again, it has all the items to check off again. Other times a strategically placed note is the most effective reminder.
Most PDA's are no longer made now that Smartphones have become so popular. You can still get them second hand, often at a cheap price via EBay.
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"Reality is not made of if. Reality is made of is."
-Author prefers to be anonymous.