How We Got Where We're Going
I was lucky enough that the very first piece of QaF fanfic I read was "How We Got Where We're Going" by allie_quixotic. I think I had just finished watching all 5 seasons and went online to see if there were fansites or something (anything!) to let me know I wasn't alone in my love of the show and I came across this website http://www.queerasfolk.wired-hub.net/home.html , found my way to the fanfic and clicked on the very first one (listed alphabetically). It's still my favorite fic of all time, and not just because it was the first one I read... it's just that good.