Home page for the Victorian Woodworkers association (with info on various hardwoods):
http://www.vwa.org.au/

Aust. Wood Artists Promotion page with pictures of work using gum and other species:
http://www.woodart.com.au

A bulletin board where you might get more answers about "gum" trees:
http://www.woodart.com.au/awapboard

The Australian National Botanic Gardens, Canberra, Australia All about eucalypts:
http://155.187.10.12:80/projects/eucalypts/eucalypts.html
http://www.anbg.gov.au:80/anbg/anbg-introduction.html