I sometimes get lazy and just use straight grain, but I really like the bias binding, especially if I want to use a stripe and make it "spirally." I found a neat way to cut it without using a really long ruler and worrying about the fabric moving. It is on the allpeoplequilt.com website and I think it was made by Heather Mulder Peterson of Anka's Treasures. It's called Quick-Cut Bias Binding. I found continuous bias binding to be too hard for me to master.