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Feedstore Provider should implement IContentCmdletProvider
IContentCmdletProvider and IPropertyCmdletProvider actually. I mean, the file system implements both, the registry only does IPropertyCmdletProvider... but I think it's worth implementing both on FeedStore:
The FeedStore should return from get-property the way that it does from get-childitem: Name, Title, Author, Pubdate ....
The FeedStore should return the content of the Description property when asked to get-content. You could arguably return the TITLE followed by a empty line and THEN the description, except most feeds embed HTML in the Description content, and our users could conceivably take advantage of that (but not if you include the Title).