Open Food Facts User Guide in pdf or in HTML.
Here is a short collection of links I find useful:
Products you added a picture to
Products you edited
Note: not sure what’s the difference with editor
http://en.wiki.openfoodfacts.org/Noteworthy_Products: sometimes products have rather ‘-non-standard’ information which makes it difficult to type the information. When that occurs simply go to this page and add the product to the list.
Useful queries – Open Food Facts EN : a page where you could find many queries of the search tool. It is a good place to find queries you may want to use as a template for your own ones.
List of products per country