I've finished knitting my Pi Shawl. Here it is in its amoeba-like unblocked state. I had to buy a fourth ball to finish the last four points of the edging! It's beautiful yarn, though, so I will find another use for the rest of the ball.
It only measures 57 cm (22 inches) across before blocking, but I'm pretty sure it has a lot of room to grow in blocking. I'm looking forward to seeing it after it is blocked!