Biofilms, or colonies of bacteria growing on surfaces and medical devices, can inflict intractable or recurring disease. During colonization, biofilms develop characteristics and behaviors more dangerous and powerful than those of planktonic (singleton) bacteria. In fact, these insidious microscopic collectives could be regarded as biological case studies in “strength in numbers” as they unify against external assault, resisting the host immune response as well as antimicrobials, and exact their high human and fiscal costs. Puzzlingly, although biofilms are a ubiquitous, well documented cause of infection, they receive only a modicum of the attention they clearly merit.