Via my other half.
One of the guys behind mySociety has been involved with a report on opening up government data. There is a consultation site which is soliciting ideas of what could be done if certain data was released. One of the ideas is something I've dreamed of having for ages, even going so far as to make a FOI request (which never got actioned).
There is a cross over with my previous post about mobile devices. Geo-location driven services are going to benefit from all sorts of public data being available.