The most detailed book that I have come across, addressing issues and design practices in analog layout (CMOS and bipolar). It is a combination of extensive layout experience (reflected in easy-to-use thumb rules) and the technical reasoning/nuances leading up to layout decisions. Strongly recommended not only for those starting out with their first design, but also for those who think they have a "feel" of layout practices without really knowing why.
Other comments:
- Content and flow are easy to follow
- Intuitive description of issues
- Process related factors are broadly covered explaining the gist of the matter
- Extensive references for follow-up