IP Australia -        Australian government site;  contains an explanation of the patent system

Patent lens  -       free worldwide searching of patent databases  

pat 2 pdf  -           pdf copies of US patents

PCT countries  -   countries accessible through an International (PCT) patent application and time limits

AusPat Database   - search for an Australian patent or patent application

Australian Designs Database   -  search for an Australian registered design or design application

Australian Designs Journal - search the official Journal for activity on a registration or application