Nancy Zieman (Sewing With Nancy) has a book out that shows how to use all of the different feet. I seen this on her show and then checked it out from my library. Different feet can make sewing sooo much easier and more professional looking too!
A walking foot helps keep the many layers of fabric and batting together as you sew, less/no slippage. :D
Many many types of 1/4 Inch feet are available. Piping foot, open toed foot, satin stitch, edge joining foot, cording foot, sequin foot, there are so many. Check out the different sewing and vacuum web sites, many have all these feet and more. You can then search for tutorials on how to use them :D