Dump the script idea.. That is far to fake for a good quality podcast.. Let's have a scheduled list of things to talk about rather then a set script.
To refer you to an extremely successful podcast. Goto YouTube, search PKA by WoodysGamertag, I know it isn't the same kind of podcast, but we need to do something like that in GT5 context. Talk about the game, talk about things we've experienced, talk about real world things whether or not it will be racing/automotive or not, make it be a fun program based around GT5 but loosely based on it.