Australia
The Cambridge Companion to Australian Literature. Ed. Elizabeth Webby. Cambridge & NY: Cambridge UP, 2000. Ten survey articles on various genres and periods of Australian literature, plus a good overall short history by Webby. Print edition also available at PR 9604.3 .C36 2000.
The Oxford Australian Dictionary. 2nd ed., 2004.
The Oxford Companion to Australian Literature. 2nd ed. Ed. William H. Wilde, Joy Hooton, and Barry Andrews. New York: Oxford Univeristy Press, 1994. Frequently updated.
Clancy, Laurie. A Reader's Guide to Australian Fiction. Melbourne: Oxford UP, 1992. In SRLF. Request it through interlibrary loan by clicking the link, signing in and using the Request feature.
New Zealand
The Dictionary of New Zealand Biography. Wellington: Allen & Unwin, 1990-2000. 6 volumes so far, covering 1769-1980. Online & Geisel 5th Fl. CT 2882 .D53 (volumes 3 & 4 only, covering 1901-1940).
The New Zealand Oxford Dictionary. Ed. Tony Deaverson and Graeme Kennedy. 2005.
The Oxford Companion to New Zealand Literature. Ed. Roger Robinson and Nelson Wattie. New York: Oxford University Press, 1998. Frequently updated.
Most of these websites include more than just "literary" texts. Some primarily consist of primary sources, others of secondary sources; some include both. For more details on these resources and some additional ones, consult Courtney & Christenberry.
Australia
Australian Poetry Library. Based at the University of Sydney, this site provides texts of tens of thousands of poems by Australian poets
National Library of Australia Digital Collections. Books, pictures, maps, sound recordings, manuscripts, and more. IncludesTrove, an unrivalled digital repository of newspapers, periodicals, images, books, and other online resources.
PANDORA: Australia's Web Archive
Australasian Digital Theses Program (ADTP)
New Zealand
National Library of New Zealand Digital Collections
New Zealand Electronic Text Centre
New Zealand Electronic Poetry Centre
Websites relevant to both countries
Eighteenth Century Collections Online (ECCO). Useful for primary sources on the early colonial exploration and settlement of all of Britain's colonies.