It needs to be low cost so the council is happy to change things quickly. Big investments lead to sticking with solutions that are possibly outdated or inappropriate, simply because of the money sunk.
I know Newcastle City Council are already toying with the idea, but I may have a way for monetising all that decent traffic such sites generate via a self-serve DIY ad system, www.addiply.com You can see it in beta trail mode on www.TheLichfieldBlog.co.uk where both the local Tory MP, Michael Fabricant, is digitally engaging with his constituents and where Lichfield DC itself is due to follow suit. Beauty of Addiply ...more »
Although many Councils are tied into licensed products which they have invested heavily in, it's worth planning ahead. Open source software offers a great deal of flexibility.