PhotoWipe can magically remove elements from your photos. You simply paint over what you want to go. The program tries to figure out what would be behind that object. It does this by pulling information from neighboring pixels.
You can remove bars or a chain link fence. You could take out graffiti on a wall. It won't work for everything. And if you look closely you can make out the edit. But the results are surprisingly good. Just draw over something and it disappears.