Moving to Oz: migration-related online communities
Previous posters have already published a link to the website of the Australian migration authority. I'll just put here a fast link to their migration FAQ:
http://www.immi.gov.au/faq/migrate/index.htm
Also:
British Expats
http://britishexpats.com/forum
The largest expat community. This part is dedicated to life in Australia:
http://britishexpats.com/forum/forumdisplay.php?f=54
And
this is their Useful Links.
Migration - procedural stuff forum.
There's also a possibility to connect via Usenet:
nntp://misc.immigration.australia+nz
(you don't want to click it if you never used it before

)
Go Matilda
http://www.gomatilda.com
Migration, businesses for sale, rent, etc. Again, more Brit-oriented.
http://www.gomatildaforums.com
These are their forums - migration stuff and regional communities - Sydney, Melbourne, Perth, Adelaide and others. Registration needed for the regional community forums. These are slightly less than British Expats but still very informative.
ASA Group
http://www.australia-migration.com
Another migration related website also containing base info on life in Australia.
http://forums.australia-migration.com
Another migration forum, very large and nicely divided into subjects. The community is less monocultural than in British Expats.
AusTimeline.com
http://www.AusTimeline.com
Tracking applications. This is NOT an official website. People post their data of their own free will. Believe me, very helpful while waiting for the outcome.