Mostly for arete, but if anyone else is just dying to read Highlander fan fic with Sean Burns analyzing Methos....
http://www.daire.org/refuge/index2.html#lesliefish
Password of Time is the first one, although Jung at Heart is kinda prequelish.

More:
http://lesliefish.ashtonpress.net/
Purgatorio and Pilgrim's Progress are the ones I was thinking of, they're sequels to stories by Ysanne, which were okay,too.