I just watched a Fons and Porter episode where Marianne had Diane Aholt on who showed how to cut bias strips quickly from a square of fabric.
I never saw this technique before although maybe lots of you might already do it this way.
1. Cut a square of fabric (at least 24", but larger is better and makes longer strips).
2. Iron the fabric in half, then quarters. Then open up flat so you can see the creases.
3. Fold each corner to the center where the creases intersect making a smaller square. Do not overlap any of the edges. Just butt them against each other and all points should meet in center.
4. Cut one folded edge off approx. 1/8".
5. Now without opening the folded square, continue cutting the correct width strips.
You will now have several bias strips that are ready to be sewn together, end to end, to make one long bias strip.
There is a little waste fabric from where the corners met, but that's all.