When I take a photo on my iPhone it is added to both the Camera Roll and Photo Stream. I can then upload the photo into "permanent" storage in Mac iPhoto either from Photo Stream or Camera Roll (during a sync).
Is there any difference in the photo stored in Camera Roll or Photo Stream?
Photo Stream automatically reduces the resolution when it transfers a photo to an iOS device. Does this down resolution process only apply to photos transferred to a different iOS device, i.e. a photo taken on the iPhone is full resolution on the original iPhone but would be down sampled if Photo Stream transferred it to a different iPhone?
Is there any easy way to delete multiple photos from Camera Roll and Photo Stream on an iOS device? One at a time isn't exactly practical for the hundreds of photos I might take on a long trip.