The following resources are ones that I personally recommend and are not a comprehensive list of available resources on this topic.
Association of Visual Language Interpreters of Canada: AVLIC is the only certifying body for ASL-English interpreters in Canada through the Canadian Evaluation System.
Association of Visual Language Interpreters of Canada Member Directory: A searchable database of Canadian interpreters.
The Basics of Working with an Interpreter: An article by Kathy MacMillan
FCC Video Relay Service Consumer Guide: A downloadable guide to Video Relay Service. (.pdf format)
Info to Go: Working with Interpreters: A tipsheet from the Laurent Clerc National Deaf Education Center:
Registry of Interpreters for the Deaf: The official website of the Registry of Interpreters for the Deaf includes information on how to become an interpreter, information for consumers on hiring and working with interpreters, and a variety of useful Standard Practice Papers on topics such as business practices for interpreters, coordinating interpreters for conferences, and working with interpreters in specialized settings such as legal and medical sites.
Registry of Interpreters for the Deaf Interpreter and Agency Locator: Searchable databases that help you find qualified interpreters throughout the U.S.
Sign Language Interpreters in the Classroom (National Deaf Center): A resource guide for teachers and institutions.
Sign Language Interpreters in Your Library: What You Need to Know: an article by Kathy MacMillan on Storytime Stuff
Teaching Tips When Working with Students Who Use ASL and the Role of an ASL-English Interpreter by Susan Frampton, NIC: A helpful guide for teachers.
Working with an Interpreter in The Classroom (ASL Stew) (7:30): This video gives tips for working with an interpreter to make communication happen in your classroom.
Working with ASL Interpreters Handout: A printable handout from Kathy MacMillan