As you can hopefully tell from the show, Rob, Nick, and Brett have a good time just hanging out. They all met at various conferences and after a few days of discussions and developing a friendship, they decided to collaborate and produce a podcast called "The SharePoint Pod Show". The first show was published on July 31, 2008.
Even though they (hopefully) sound like they are recording in the same room they actually are quite spread out across the globe. Nick lives in Reading, England, Brett lives in Sarasota Florida, and Rob lives in Nashville, Tennessee.