Wikipedia has a growing article on Arthur Upfield and his books
http://en.wikipedia.org/wiki/Arthur_Upfield

Robert Wilfred Franson has some good information on Upfield and Bony as well as a checklist of titles
http://www.troynovant.com/Franson/Upfield/Inspector-Bonaparte-series.html

Kees de Hoog has a page with some good information on Upfield and Bony
http://www.collectingbooksandmagazines.com/upfield.html

Andrew Heenan has a great site with lots of information and pictures
http://www.quaggabooks.co.uk/upfield/

An Arthur Upfield discussion formum exists at
http://heenan73.proboards.com/index.cgi?

You can learn more about the Norfolk Int'l "Boney" TV series at Don Storey's site
http://www.classicaustraliantv.com/Boney.htm

Sources for Arthur Upfield's Books

While I built my collection before the days of the days of the Internet, used bookstores, at least in North America, rarely now have any Upfield titles. Your best bet is now the Internet. You might also check the Interlibrary Loan department of your local library.

For out of print books, I've found the best source to search is the Advanced Book Exchange
http://www.abebooks.com

There are usually a few Bony novels in print at any given time and I've found that the best source to find them is Amazon.com, although you may simply want to use it as a resource to find them and then order them from a local bookseller.
http://www.amazon.com

The Beach of Atonement was recently brought back into print by Jan Finder via Lulu. Kees de Hoog has also used Lulu to publish two collections of Upfield-related short stores and autobiographical information: Up and Down Australia and Up and Down the Real Australia: Autobiographical Articles & the Murchison Murders. Just do a search for "Upfield."
http://www.lulu.com