To see them all go here:
My top 3
1) Xenia Onatopp (Famke Janssen)...amazing looks and a penchant for killing makes her incredible
2) Mary Goodnight (Britt Ekland)...she looked super hot in her bikini as she dumped the black guy in the vat, which causes the island to explode in The Man with the Golden Gun
3) Tracy (Diana Rigg)...yes I know she's from a Lazenby 007, but coupled with her performance in the Avengers, I have a soft spot for her.