If you are thinking about purchasing a sewing chain that includes Machine Embroidery then you will want to read All About Machine Embroidery. I have 31 entries that answer every possible question you can think of and a few you may not know about. The Seasoned Homemaker.
Machine embroidery basics - totally new to machine embroidery? Check this out. It may look automatic, but really there's technique, skill, proper materials, and a fair amount of voodoo involved to make it work right. Kidding about the voodoo. Kind of.