I know there are a number of organisations and projects out there that are trying to encourage collaboration between Councils, but ironically many of them don't seem to be that good at collaboration themselves.
I think part of the answer might be to build an organisation/platform independent community of interest - a group of Local Government people interested in inter-Council collaboration that are willing to hold regular discussions in a range of different forums.
I'd be very interested to hear from anyone who would categorise themselves as "interested in inter-Council collaboration", and if they are in contact with like minded individuals how they communicate with them?
Also I have listed below a few potential places where discussions could be started.
Innovation and Knowledge Exchange Network
eGovernment Resource Centre
Local Government & Municipal Knowledge Base