+1 except for one thing: In section 4.1.2, I'd suggest something along these lines:
atom:entry elements which do not contain an atom:content element, or whose atom:content element's type attribute indicates a MIME media type, SHOULD contain an atom:summary element.
- PaceTextShouldBeProvided Antone Roundy
- Re: PaceTextShouldBeProvided Sam Ruby
- Re: PaceTextShouldBeProvided Robert Sayre
- Re: PaceTextShouldBeProvided Sam Ruby
- Re: PaceTextShouldBeProvided Robert Sayre
- Re: PaceTextShouldBeProvided Graham
- Re: PaceTextShouldBeProvided Robert Sayre
- Re: PaceTextShouldBeProvided vs Pa... Tim Bray
- Re: PaceTextShouldBeProvided v... Robert Sayre
- Re: PaceTextShouldBeProvided v... Tim Bray
- Re: PaceTextShouldBeProvided v... Robert Sayre