As I am in the planning stages of the garden, I have been looking for some lists on the internet.
Here are some of the links that were helpful:
Sustainable Gardening Australia - great as it also has a discussion first and includes plants that are bad neighbours as well as good. For example, I did not know that parsley and lettuce are bad neighbours.
The Permaculture Research Institute - this is a PDF, so you can print it. Maybe even laminate to keep in the gardening shed.
Mother Earth News - article on companion planting.
Green Life Soil - and that silverbeet loves lavender.
Heirloom Organics - this includes a companion planting garden map/layout and an explanation of the Three Sisters planting. I am planning on trying a Three Sisters planting this year.
Small Farm Permaculture and Sustainable Living - this contains a few planting guides, including one for fruit trees. There are lots of useful articles at this site - well worth a browse.
Urban Allotments - this list contains quite a few plants not on other lists, such as aniseed. And comfrey is a great slug trap.
And let's face it, it will make your garden look SO pretty!! Do you plan your garden using companion planting principles? Have you found any pairings that are particularly beneficial?