My current bedtime reading is Elizabeth Zimmerman's "Knitting Without Tears". I came across her method for joining a new skein of yarn while knitting, without making a knot. This technique may be in plenty of other books, but it was a new one on me. Unfortunately, it only really works with yarn of the same colour.
I gave this a try, trusting that EZ said it would work, and even using a chunky/bulky yarn it works a treat:
On the subject of EZ, I realised that American readers have an advantage; they can refer to Mrs Zimmerman as "EeeZee". Unfortunately, we Brits - who have a different pronunciation for the last letter of the alphabet - must be content with referring to her "EeeZed".