Books, especially younger books, need a strong driving force to keep them growing and to keep them on track. So often, the author of a new book abandons it before the book has reached a stable and mature status. Without a certain amount of stability, new editors don't contribute to the book, and it languishes over time. Wikibooks has many books that really just need to be adopted by new authors, authors who have the necessary vision and energy to turn a forgotten book-stub into a great educational resource.
[[Human Anatomy]]: Most of the links in the TOC are red, and the few blue links point to mish-mashed pages with all sorts of random content. This book has also been nominated for a merger with [[Anatomy]], which is in a similar condition. Compare this book with the fantastic [[Human Physiology]] book, which has tons of content and images.
[[Semiconductors]]: I started this book as a way to combine several stub-books and pages on this topic. Unfortunately, it isnt an area of expertise and I haven't been able to add to it much. Proof that even an experienced author can get in over his head. Since many of the pages were merged in from other books, there is very little continuity of discussion, nor commonality of formatting.
[[Geometry]]: There are many links in the TOC of this book, but most of them point to stub pages. Also, all the pages are named in a very non-descript fashion, such as "Geometry/Chapter 1". Comparse this to an excellent geometry book for younger readers at [[Geometry for Elementary School]].
[[Psychology]]: A subject that so many students study, but for which we don't have a good book. This book has only a few pages out of a relatively large outline. The few sub pages are either stubs or outlines themselves.
This is just a very small listing of books that need some help. Hopefully, i'll be able to list a few other good ones here eventually.