However, until recently, it's been difficult to fast forward or rewind in a podcast, given the tiny little scrubber.
While scrubbing left and right, drag your thumb towards the bottom of the screen and the scrub speed will change from "High Speed", through "Half" and "Quarter" to "Fine Scrubbing", where moving the thumb from left to right effects only a few pixel change in the scrubber.
[crarko adds: I've done something like this on the iPhone and iPad, and it does give you a little tip about it when you go to scrub through the media you're playing. Still, it's one of those things that's not that obvious so I think it still qualifies as a hint.]

