I found some stuff on the internet, but it's not so complete, and its from the UK.
I think there might be more lists on the forum. Anyway here goes:
Things you need to do before you go, not in any particular order they get added as they get submitted. ! if you have any more to add please contact us.
(Usually you also get check lists from your shipping company, I have some too)
1) MAKE A LIST!!.
2) Cancel all contracts, telephone, utilities, mobile phone, house insurance, community charge etc. Always best to do it in writing and keep a copy.
3) Cancel standing orders, direct debits etc. for the above and make sure you cancel with the bank as well as the company. If you have yearly subscriptions to anything make sure they are cancelled as they are easy to overlook.
4) Driving licence - notify DVLC of address change, and cancel your car insurance, get letter confiming No Claims Bonus as you can use it in Australia.
5) Notify, tax office, insurance company (life insurance etc.) if you have shares notify company of change of address.
6) Send back as much junk mail with "moved and gone away return to sender" on them (cuts down on mail needing to be redirected) best to start this a few months in advance.
7) Sort out your mail redirection.
8) If you have bought a laptop to use while PC is transported, don't forget to copy across all your email addresses, contacts and favourite sites as well as copies of all documentation that you may require.
9) Arrange to ship your belongings, see shipping. for list of companies.
10) Book your flights, see travel for good deals on flights.
11) Mobile - should work in Australia but you may need to "unlock" it. Some Nokia Models can be unlocked for £3.50 BY EMAIL . See Phone Freedom or take a look at Unlocking Mobiles. Once unlocked you can buy a pay as you go SIM in Australia for about $25.
12) If you have children, get school reports, vaccination records. (medical notes if possible).
13) Decide on Australian Bank Account. If you going to open an offshore account do it before leaving UK.
14) Make a will. If you make a will in Australia it overides any UK will, its best to have a Uk one covering UK assetts and an Oz one covering Oz assetts but have reference in the Oz will referring to UK one..
15) Book your flight. Also get your accomodation arranged.