I've just released a new e-book about inattentive ADHD. The book is entitled Lifting the Fog: A guide to inattentive ADHD in adults.
The book is based on research from I've teased out of other books and articles as well as discussions with members of ADHD associations. The first part of the book looks at how inattentive ADHD differs from other forms of ADHD, while the second part focuses on treatments and coping strategies. There is also a short list of recommended books and websites.
As far as I am aware it's the only book available which is specifically about inattentive ADHD in adults.
You can download a sample of the book from Scribd.com, or buy it for $2.99 (US) from the self-publishing site Smashwords.com.