BackTrack 4 have SSlStrip v0.1 by Moxie Marlinspike and there is the v0.2 that fix the listen port command-line option. Please fix it!
It's very usefull program, can capture cyphered conections. Change all the secure conections, https, by http. If you do a MITM attack ( with ettercap, for example ) you must capture all the cyphered passwords.