The following are links to Tobruk memorials and other named organisations etc in Australia. 
A good source for these and other memorials is the

Canberra - Anzac Parade Canberra - Walking Tour Podcast for Rats of Tobruk Memorial
Townsville Tobruk Memorial baths - Council Site Rats of Tobruk Memorial Pipes and Drums
Rockhampton - Jeffries Park1 Full View
2 memorial stone (Not working 19/04/2012)
St Joseph's Tobruk Memorial School - Beenleigh
Mackay - Rats of Tobruk Memorial St Joseph's School Tobruk Memorial - Beenleigh
Bundaberg - Rats of Tobruk Memorial 
See also Bundaberg Lions Club Project
St Joseph's School Tobruk Memorial - Beenleigh
Perth - Tobruk Memorial includes Army, Air Force and Naval details. St Joseph's Tobruk Memorial School - Foundation Stone Plaque
Heidelburg Hospital - Tobruk memorial plaque near Out-Patients Adelaide - Tobruk Memorial location is behind 
Government House (see page 8 of booklet) (Not operating 19/04/2012)
Heidelburg Hospital - Tobruk Fig Tree Plaque 
near Out-Patients (Down as at 19/04/2012)
South Australian National War Memorial - Cross of Memory 
(see page 12 of booklet) (Not operating 19/04/2012)
(Tobruk House (The Rathouse) - North Bondi RSL Tobruk Memorial Drive - Picnic Point Toowoomba (Not working 19/04/2012)
Tobruk Fig Tree - Port Lincoln Toowoomba Rats of Tobruk Memorial and Plaque
Brisbane - Roma Street Parklands Rats of Tobruk Shrine Canterbury College, Waterford - Tobruk Fig Tree
Series of Roma St pictures - Overall, Side 1, Side 2,  Plaque 1, 
Plaque 2
Garrison Plaque
ANZAC Square Brisbane - 15th and 2/15th Bn Plaques
ANZAC Square Brisbane - Shrine of Memories  

Anyone know of any more?