Xena as my number one. Number one!!!! Lucy lawless also did a great job in Xfiles and Battlestar Galactica.
And speaking of BSG, where is Katee Sackhoff??? (Starbuck and also on the ill-fated Bionic Woman). Please give her my second vote.
Gillian Anderson in XFiles, please.
Also Love: Summer Glau, Linda Hamilton, Sigourney, Sara Michelle, Milla, and Renee O'Conner (Gabrielle in Xena). Okay, and add all the females cyclons in BSG (Tricia Helfer and Grace Park, besides Lucy Lawless).