The Slip, Slip, Purl stitch is commonly used during the heel turn of various types of heels. It's not quite as intuitive as it seems - you need to work the purl part from the back. Take a look.
by Purl Soho
by Cool Wool Design
by The Knit Crowd
by Interweave Craft
by AlpacaDirect
by planetpurl
by TheCraftsChannel
