How do I delete all pictures off an iPod Touch? I'm running Windows iTunes and have copied my DCIM folder to back it up, now I want to delete all the pictures like I would on a digital camera, but the folder appears to be write protected and unchangeable.  

What's the easiest way clear out all the pictures in lieu of doing it one-by-one.  I'm sure it's obvious, but it appears to be non-obvious.
View the list of photos in the Camera Roll (or other album), hit the Actions button in the upper-right (the button with the rightward-pointing arrow). Now, when you tap on a picture or video, it greys out a little and gets a checkmark. Check all the items you want to delete and hit the red delete button at the bottom of the screen.