Metal Melting Mirrors?

The concept of using a mirrors’ light reflecting properties to harness solar energy into a single point with enough heat to melt steel sounds like the plot device from some James Bond movie but according to some MIT students it seems possible.  As explained in this Discovery News article the students have already constructed a mirror that is capable of using reflected sun light to light wood on fire.  The student hope to use similar mirrors to produce cheap renewable heating sources sometime in the near future.