Wood started a mitten project and asked about how to fasten them together with an idiot string. I'm going to sneak a really good little tutorial in here that explains how to make an "I-cord". There seems to be some debate about who invented this little gem, but the word on the street generally credits Elizabeth Zimmermann with its conception.
*Edited to add: Alternatively, Wood gave me a tip on another (read: more useful) YouTube clip that helps, too. Here it is (I wasn't allowed to embed it, so you'll have to go and view it there).*