Last year there was a lot of buzz around this Dutch scientist idea of mixing bacteria in the concrete, so they could produce limestone and potentially fix cracks. Does any one know if his idea is even close to commercial production?

Article at http://www.iflscience.com/chemistry/self-healing-concrete-repairs-its-own-cracks/ 

Its probably not commercial yet. But that was foam concrete also not in the beginning. And now it is widely spread. isolated concrete is almost comercial, the only problem is pumpability. And there are lots of other thing these wizkids are working on>

Hadnt seen that one yet, looks pretty cool.