Book on yeast reproduction, evolution and on the use of yeast as model organism
Here is my list, in no particular order.

Methods in Yeast Genetics

Some other yeast books at CSHL

Fred Sherman's primer, available free at various sites including here.

The Freiburg manual here

The timeless classics (link to volume 3 but see all volumes)

The YeastBook is an attempt to build a current encyclopaedia to replace the previous item on my list.

The Saccharomyces genome database, probably the best organism-specific resource ever.