Thanks guys, I got hooked as a kid in 89 with re-runs of Batman 66. However by that time, Killing Joke had just come out, so I had to look for back issues for my Batgirl fix.
I started grabbing all of her appearances during college in the late 90s when stuff was still dirt cheap.
Me and a couple of collectors online started making a list, and I started a website (rather dormant these days) to track it all: http://batgirlarchives.8m.com/
It was a joy during those days thumbing through long boxes just looking for a shot of Babs.
As far as stories go, my first love is Batman Family. Her and Robin were great together, and it exposed me to the 50's reprints. Gil Kane had a short run in backups of Tec that are good as well.
Favorite cover? Gotta be the run in my tights!