Just over a month ago, I posted about Visualising Geo-temporal RSS Feeds, in which I pondered on various mashup interfaces that could be used to display data contained in an RSS feed on a split view containing a timeline visualisation of the feed items, as well as a map view depicting the geo-location of each item, like this Earthquake mashup by Jörn Clausen which combines a Simile timeline with Google map:
musing on a possible timeline UI for gmaps