If you have been contemplating a short sale - you will want to make sure the agent or agents you choose are well versed in the short sale process.
What you don't want are agents that "farm out" your short sale to other third party negotiators.
Make sure they have expanded and handle all of the short sale negotiation 'in house'.
Here is our most recent video that talks about the Short Sale processes from a buyers perspective. However, it will be of great assistance to you as a Seller contemplating a short sale.