Hi Moonstream,As for resources for someone with a fearful dog... I would say that depends on 1) what trigger the fear is attached to and how it is expressed (ie, is the dog fear aggressive, or just fearful, and is that directed towards other dogs, strangers, all people, just men, bikes and skateboards, etc), 2) what you're looking for in the resource (ie, are you looking to just find out more about what goes on in a fearful dog's mind, if you're trying to learn about behavioral modification, or maybe you just want to know more about dog behavior), and 3) your current knowledge level.
Just to throw some stuff out, while I wait for more information about what you're looking for, though...
I haven't looked at it in depth, but from the times I've browsed I do like the website fearfuldogs.com.
Patricia McConnel has a lot of great stuff, including the book "The Cautious Canine", which is specifically about fearful dogs.
Jean Donaldson, Ian Dunbar, and Sophia Yin are all/have been fairly prolific writers on dog behavior and behavioral modification. Grisha Stewart has some cool behavioral modification procedures as well, namely BAT 2.0.
Kikopup and Zack George both have stuff on youtube that has good information bout general training and behavior, which are important to know about with a fearful dog.
The book "When Pigs Fly" by Jane Killion is a great lesson in managing reward in a training environment, which goes a long way towards making you a better trainer. Not related to fear, but important in general training.
If you don't know a lot about dog body language- or even if you do- I cannot recommend the book "Canine Behavior: a photoillustrated handbook" enough. Lots of information about how dogs express themselves through body language with pictures of different breeds and types showing the behaviors it talks about.