Well, I rekon that longshot system I posted where you select a couple of horses showing half decent odds that have won previously might be good. Maybe only bet them if the horse showing good value in the odds has a certain jockey and trainer combo. The logic being you are putting your money on the jockey & trainer since they have shown good form as well as the horse.

Since its been mentioned thats more often than not horses don't win again after winning, since its got good odds for a win, place bet instead of win bet since the place bet should be good value to.