This Wiki page is edited by participants of the HTML Accessibility Task Force. It does not necessarily represent consensus and it may have incorrect information or information that is not supported by other Task Force participants, WAI, or W3C. It may also have some very useful information.
No accessibility-specific issues noticed for links. I found the difference between <link> vs <a> and <area> elements confusing, as well as the fact that some content impacting this section was located in the "inline markup" section. I also found it problematic that link types can be extended merely by editing a wiki, as I don't think the process provides enough assurance that the material there is quality, in spite of the procedures outlined in the spec. However, I don't think these issues are specific to accessibility.