Starting her career in 1998, Sackhoff was in a number of different failed TV shows and made for TV movies. Her first film role came in 2002, with the movie "Halloween: Resurrection". After "Halloween" Katee did some voice work for "Halo 3", and took parts in the TV shows "Bionic Woman", and "Nip/Tuck". It wasn't until 2004 that Katee got the role that she is best known for, the role of Starbuck in "Battlestar Gallactica".
If you get a chance, you should check out her website. She has a pretty kick ass blog on there, which she updates pretty regularly http://kateesackhoff.com/