From time to time, I will list review articles that I found inspiring and enlightening. To start with, I greatly enjoyed the following:
Kevin D. Young. 2006. The Selective Value of Bacterial Shape. Microbiology and Molecular Biology Reviews, 70 (3), 660–703 PMID 16959965
To quote from the first paragraph:
To be brutally honest, few people care that bacteria have different shapes. Which is a shame, because the bacteria seem to care very much. A simple way to verify this is to take a leisurely stroll through Bergey's Manual of Determinative Bacteriology or The Prokaryotes, pausing to admire the surprising and bewildering riot of shapes, sizes, and aggregates, some of which are illustrated in Fig. 1.