Slightly off topic perhaps but it seems not all smart city initiatives are created by cities individually. In the UK I am beginning to find that some initiatives, particularly open data and transparency are being encouraged by the state (i.e. the UK).
This website is a UK wide website with almost 24,000 open data sets:
This related page is interesting: http://data.gov.uk/apps
Apps everything from the location of public toilets of the Isle of Wight to road traffic injury maps for the whole country.
Back to data itself, this website: http://opendata.esd.org.uk/ seems to be a repository of open data sets from local authorities (including cities). Councils are even offered government funding to encourage the release of open data.
Sorry this post is very UK focused but what do you think – are we heading towards a data deluge here? – lots of available datasets in different formats but no connections between them?