A while a go, the idea was put forward to create a common online resource that Diagnosticians could use for psting media recipies, testing procedures, and other useful protocols. We've given a start to that project within the BugwoodWiki. Take a look at the beginning of this effort we've called the Diagnosticis's Cookbook.
The Bugwood wiki has 'permission only' authorship. If you would like to contribute to this resource as an author or just by submitting material, contact Joe LaForest.