Supporting innovation within government agencies via intranet and web

I've set myself a personal challenge this financial year to support innovation within my agency at all levels.

There have always been innovative people throughout organisations. Their challenge has been distribution and access - promoting their ideas to the people that could champion and introduce them.

Being the custodian (not the owner) of our website and intranet gives me access to a channel that can support the distibution and promotion of innovative ideas.

What systems or tools does your organisation have in place via your intranet or website for encouraging and supporting innovation?