Addi Addi Clip Hearts. If you are starting a project, like a shawl, that will increase in size as you're working in rows back and forth, you'll love these.
ClipHearts attach to your addi circular cords to shorten the space between your work and the tip of your needle. Its like working with straights. Setting your project down for the night, slide your knitting to the middle of the cord and attach the ClipHearts on either side to act as stoppers.