I picked up this link from a site James turned me on to. The site is called 43 Folders. It is so named for a particular filing system wherein you make a perpetual planner system using 43 folders, 31 for the days of the month and 12 for the different months. They have lots of good stuff on organizational habits and such, but they linked to this story that caught my eye. The article discusses a number of different approaches to improving your memory and brain power. The article doesn't offer detailed exercises, but it does point you in the right direction.