Yes it is, according to Todd Cochrane, and he is not too happy about it. You can go over and read about it at his blog, but what it seems they are listing as the RSS feed for his podcast is a mash-up of it hosted at the Podshow site. And it also seems they are stripping the Copyright from it and replacing it.
Dave Winer, the man responsible for adding the enclosure tag to RSS (and RSS itself) is not too happy either that Podshow is doing the same with his Morning Coffee Notes podcast feed. He also cites some other examples. There are others weighing in which you can see in an update at the bottom of Todd's post
Today Todd added a second post explaining more why he is so upset with this. He shows with screen shots some of the changes being made to his RSS by Podshow. He makes mention of the fact that the programmers behind Podcast Alley, which had an uproar against them and the way they reused RSS for podcasts are part of Podshow, and that they should have known the outcome of doing the same thing again.
Update: According to Todd's post Podshow has fixed what they claim was a bug, but he still stands by his original posts.
1. They are trying to claim it's a bug. I kinda want to believe them, at least partially. I'm as much of a Curry hater as anyone else, but I find it hard to swallow that they'd be so blind, arogant and uh, Web 1.0ish (for lack of a better term).
Posted at 3:24PM on Jul 7th 2006 by Grant Robertson