Stephen Mejias's Super Zero review was real timely for me. I've been looking for a small unpowered speaker to use in my second system. The Audio Engine P4 really intersts me. They're $50/pair more expensive, 3# a piece heavier and a half inch bigger in each dimension than the Super Zero's. But have gotten some good press online.
A suggestion for Stephen: Check out the P4s and make some comments.