I use CyberDuck and last time I did this on my 4 running iOS 4.1 I used to be able to launch SB Settings and enable ssh, now i am not so sure how this can be done.
Like BumpyFlatline said it still works the same. Might need to enable openssh by going to sbsettings and clicking more, set window toggles and turn on openssh. But think by default it is on?