"The Dietitian's Guide to Eating Bugs" by Daniel Calder is a new 
e-book. It is the most comprehensive book on this that I've seen.

He believes insect breeding and consumption are important elements 
sustainable living, particularly when it comes to complementing 
foraged plant material with meat products. Numerous insects contain 
nutrients similar to those found in more conventional livestock, 
except the feed to conversion ratio is much higher and they're much 
cheaper to breed.

Here is the link to the text:
<http://www.scribd.com/doc/160318509/The-Dietitian-s-Guide-to-Eating-Bugs>http://www.scribd.com/doc/160318509/The-Dietitian-s-Guide-to-Eating-Bugs

It is also availble in e-book format for $35.