Reading this article bummed me out until I was reminded of my own experiences with increasing working/short-term memory through the use of N-Back games. In my own n = 1 study, I struggled through dual 2 back initially, but with a few weeks of practice, I gradually was able to climb up to the dual 4 back level, and stopped there out of sheer laziness.
Anyways, for anyone interested in N-Back games, check out the Brain Workshop software and website.