You should use [id://...] for links to other nodes. If you want to change the text of the link, then you can do [id://...|New link text]. This will allow your node to work in the face of changes to the perlmonks backend, and also will not take people to a different domain (e.g. I browse from http://www.perlmonks.org, but your link is to http://perlmonks.org, thus my cookie isn't being read when I click on your link, and I end up logged in as Anonymonk).