I predict Manthorp's ramblings will engender a following like Wogan's morning show.
As an aviation nerd, I like the format of the
Airplane Geeks podcast, a weekly podcast about the world of aircraft and stuff.
They start off with a brief inrto, then the news (a la Top Gear I suppose), then they have a guest, some "this week in aviation" historical stuff, then they cut to the Australia desk (the main show is set in the US) after some fans contacted them and said they'd like to cover QANTAS and suchlike. Finally it's an outro, some cool closing music, then a blooper reel.
Each week these guys (four hosts in the US and two on the Aussie desk) put out a 90 minute show. It's quite impressive logistically, and usually very interesting... if you're into that sort of thing.