Sometimes, I'm looking for a link to the revision as it is shown in the revision list, especially since it shows the difference between that revision and the previous one. As the author asks for an anchor, he might have intended that too (but please let me know if I'm wrong).
That feature is available too (and has been for a couple of years, but not back in 2011). It is not really discoverable; you have to open the developer tools of your browser and inspect the HTML:
You'll see that the body of the revision (not the header, unfortunately) has an
id attribute, so you can copy it: https://stackoverflow.com/posts/8149545/revisions#rev-body-56c3139b-04f7-47c1-8a3a-fab0270ccaa7. Not too different from your original suggestion!