DJ - Dolphyngyrl gave you a link to something similar to the Fabric Mover. It is a platen that moves which allows you to do about a 10x10 (can not remember the exact size) of free motion quilting. Some earlier ones came with or with out a stitch regulator that connected the moving platen to the plug for the foot pedal (you would have to ask if this one has a regulator). It was not a bad attachment for smaller projects but could be tedious on large quilts.
The even feed is called an IDT - Integrated Dual feed. This can be engaged by snapping it down and into place (some feet allow the use of this feature some do not). It is a fantastic feature - the bottom of the foot actually has a moving gripper that moves the top piece of fabric at the same rate as the feed dogs.