OK, I stand corrected . . . we don't know for sure where Juliet's allegiances lie. She may actually have feelings for Jack and wind up helping the Losties in the end. Or she may finally get tired of Ben's mind games and decide to do the right thing. She does seem to have a heart (after watching her flashbacks) and I believe she's the only 'Other' to be the focus of any flashbacks (off the island), so maybe she'll turn out OK after all.

Having said that, I still think she's a heartless, manipulative b!#@$ (played brilliantly by Elizabeth Mitchell).