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
http://world.openfoodfacts.org/photographer/USERNAME
http://world.openfoodfacts.org/photographer/bcatelin/entry-dates
Products you edited
http://world.openfoodfacts.org/editor/bcatelin
Informer
http://world.openfoodfacts.org/informer/bcatelin/
Note: not sure what’s the difference with editor
Noteworthy products
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
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.
Invalid barcode
http://world.openfoodfacts.org/code/invalid-ean