Simplest way I found is use Picasa 3. Its free. Unlock and connect your iPhone. Picasa WILL recognize it> then in top left click import photos. The drop down window will have iPhone on list, click it and your pics are on the computer. Save them to where you want. My pictures, Documents whatever. Really is that easy.
Hope this helps as gettin pics OFF iPhone can be a major pain in the %#/* . iTunes is as much use as no use so just make sure your iPhone is unlocked(homescreen) before plugging into usb. Good Luck