Over the last month I have received a few emails from fellow Inventor users trying to access older episodes of the Official Inventor Podcast. If you are using iTunes you can easily get all the episodes from there - just do a search for "Official Autodesk Inventor Podcast" and download the episodes you are interested in.
If you want to download older episodes from Internet Explorer, I made a few changes to the podcast page and have re-posted it. All you need to do is select the following link from Internet Explorer and select the episode you would like to listen to. You can also right click on the episode and "save target" to save it on your computer for later.
The first thirteen episodes are audio only - we started the video portion from episode 14 - 23.