I used to be a Jenny hater in the first and second seasons. But something turned around somewhere and I realized how talented Mia Kirshner is. I think I realized it right around the time I saw her on an episode of "24" and saw that she had really created an entirely separate character in Jenny.
She still crazy. But it's a different kind of crazy:
Here's a recent interview from Ourchart.com:
And of course my absolute favorite fan video about Jenny's character throughout the seasons, done by Laura in Montreal:
(Click here to go to Laura's youtube page.)