What do I need to know about crossing Israeli-Jordanian borders?

There are a number of crossings between Israel, the Israeli controlled West Bank, and Jordan. Knowing which crossing to use and the various requirements can be confusing.

For additional information the US Consulate has created this fact sheet with information on all the Israel-Jordan crossings: http://jerusalem.usconsulate.gov/pdfs/crossings_israel-jordan_2007.pdf