I've just upgraded to the latest release v5.2 of the platform that powers this weblog, MovableType. One of the cool new features this version brings is Custom Fields, a feature that allows additional fields to be made available at edit time.
One use of this feature is to have a URL field that allows inline links to external sites, yet it also retains a reference to it within my own publishing system. The entry appears in my RSS and ATOM feeds as a link to a page on this site, whilst the entry title on the page links to an external link. An example is the prior link to the Microformats Wiki.
Credit goes to Mihai Bocsaru for the pointer!