Rob Edwards’ choice:

http://www.ncbi.nlm.nih.gov/pubmed/21273480 and http://www.ncbi.nlm.nih.gov/pubmed/21273474

Croucher NJ, Harris SR, Fraser C, Quail MA, Burton J, van der Linden M, McGee L, von Gottberg A, Song JH, Ko KS, Pichon B, Baker S, Parry CM, Lambertsen LM, Shahinas D, Pillai DR, Mitchell TJ, Dougan G, Tomasz A, Klugman KP, Parkhill J, Hanage WP, Bentley SD.
Rapid pneumococcal evolution in response to clinical interventions.
Science. 2011 Jan 28;331(6016):430-4.

Enright MC, Spratt BG. Genomics. The genomic view of bacterial diversification.
Science. 2011 Jan 28;331(6016):407-9.