Two interesting bacteria related stories this week.  The first is a designer bacteria that can repair cracks in concrete.  Pour these puppies into our broken sidewalks and soon they'll be whole again.  http://www.msnbc.msn.com/id/40201539/ns/technology_and_science-green_innovation/
Second, and less useful but just as cool, is E. Coli that solves Sodoku puzzles!  http://2010.igem.org/Team:UT-Tokyo/Sudoku_abstract