I'm not sure how it is for Posterous, but Word press has a limit for how much they put on an RSS feed. This can usually be corrected to expand the number of shows.
As for iTunes I'm at: http://itunes.apple.com/us/podcast/bibliodiscoteque/id390553303
and you can subscribe to get all new ones downloaded automatically. I find the GPPN podcast to be the only one needed as I get all the shows put on GPPN updated as they are posted
 
 ixnayray said:
Well my 'Original Feed' is with Posterous now and all my episodes are located there. So I'd be grateful if you have any ideas... But i'm stumped.
kopper said:Probably has to do where you have your feed sourced. Is it Mevio? You'll have to login to your Feedburner account and check what you have as your "original feed," then investigate and see if your previous episodes are located there.
ixnayray said:Yeah I know that. I just don't know why.
kopper said:That's because those are the only episodes showing up in your RSS feed.
ixnayray said:Way Past Cool is :
http://itunes.apple.com/gb/podcast/way-past-cool/id416243586
I just went over to iTunes. Seems fine although you can only access episodes 13 to 30 for some reason...

                            