It seems that in some cases people are receiving Epi 22 (bloopers) instead of 23 (Year in review). If you have had this problem please use the link below to download the correct episode.
Gentrification, which is basically the re-development of older urban neighborhoods into more upscale retail, professional and residential space, is an important area of study in urban geography and often a controversial issue in many cities. A recent article on the Toronto Star website discusses some of the issues surrounding gentrification in Toronto, Canada. I think a lot of the themes in this article could apply to many cities around the world.