So I'm currently exercising my prospective memory. If you've read EWOLD you should know the exercise suggested there i.e. for about a week (or more) each day you pick up 4 events on the next occurence of which you do a RC. When I did this I thought it was good BUT when I watched the advanced lucidipedia series the guy in them (Tim I think) presented an exercise in which you set your phone or whatever you have to ring after say 5 minutes. I think that's superior to LaBerge's exercise cause for say 5 minutes almost each minute you have the feeling "you are supposed to do something".
Anyways please post if you have some exercises of your own or comment on the two aforementioned.