This is an excellent idea, and I would be glad to help out on it -- in fact, I was just going to say I wouldn't mind having it on my own site,
www.findswoman.net, either!
FFURG has
a list of female heads usable with SW parts, but it's by no means either exhaustive or up-to-date, and there are no pictures. Still, it does gives us something to start with.
So let's start just by listing things, why don't we? Starting with the Leias, perhaps, most all of which are good for fodder:
POTF2:"Monkey" Leia (torso + arms are EXCELLENT fodder, even if head isn't)
"New Likeness" Leia (white bun outfit)
Leia with Sporting Blaster (also white bun outfit)
Hoth Leia
Slave Leia
Leia as Boushh
Ewok Celebration Leia
Flashback Ceremonial Leia
Expanded Universe Leia
Leia from the speederbike
Leia from the Mynock Hunt scene
Princess Leia CollectionANH Leia (with R2-D2)
Ceremonial Leia (with Luke)
Bespin Gown Leia (with Han)
Pink-dress Ewok Celebration Leia (with Wicket)
POTJ:General Leia
Bespin Escape Leia (tiny!)
Deluxe Slave Leia
Saga and OTC:Imperial Captive Leia (white outfit, buns)
Bespin Gown Leia
Slave Leia (same as Deluxe from POTJ line)
Leia as Boushh
VOTC Leia
Leias that may or may not be fodder-able:
Early Bird Leia
Swing to Freedom Leia
Anyone care to start on the Padmés?
... the Findswoman