Helpful site design.
edit: okay, just got to the same document you did. Apparently microsoft considers 'release notes' to be 'notes about the process of releasing' which that document will have when there are any, rather than notes about the release itself, aka the Service Pack. There is another file on that link called 'Notable Changes in Windows 7 SP1' or something similar, which basically boils down the changes to: HDMI audio improvements, fix to XPS documents, and a change in the way 'restore previous folders at logon' works...
1) They released a SP as a milestone because it was 'about time'
2) They released a SP as a rollup to bring everyone to the same page
3) They need to push the HDMI audio updates extra hard...?
1. Hotfixes and Security Updates included in Windows 7 and Windows 2008 R2 Service Pack 1
2. Notable Changes in Service Pack 1 for Windows 7 and Windows Server 2008 R2
3. Deployment Guide for Windows Server 2008 R2 with SP1 and Windows 7 with SP1
4. Windows 7 and Windows Server 2008 R2 SP1 Beta Test Focus Guide
Depending on which type of information you are looking for you'd need to get the corresponding one. Note the list of hot fixes is an xls spreadsheet.
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=...
Can't they just show them to me? In their own page, or, if they somehow need to be Word docs, using the Office web tools?