For those working especially on European pre 1500 profiles, the following recent thread at the SGM forum might be important.
I know a lot of us cite that discussion group for discussions about specific difficult cases, but the old Rootsweb links we have mainly used are now being reconstructed and it is not sure how complete they will be.
Advice is given there on how to cite from the google groups versions of posts, but I think this is important:
"So if you want to cite a medieval genealogy message in a way that has a better chance of functioning 10 or 20 or more years from now, then give not only the URL (which is specific to Google) but also the newsgroup name (soc.genealogy.medieval) and the message's subject, author and date (which allows access to the message in other Usenet archives). "
This was of course always a good idea, but I have to admit to being someone who often posts raw links.