RSS stands for - Really Simple Syndication
If you wish to read about it there is a wikipedia entry for it so I don't have to explain it, Find it here.
As for the podcast, We have a replay of the highlights of the show sure. HOH, POV, all competitions. However, we also have trivia each week, Top 10 big brother moments from all the seasons voted by the members here before the season began. We also have This Week In Big Brother History. A look back at some of the moments that took place in the current week of previous big brother seasons.