Twitter Dots is a nice stylised Google Map that shows Twitter messages around the world. Each day a new keyword is used to display on the map. Today the map is showing Tweets that mention 'Iran'.
The map shows the worldwide distribution of Tweets mentioning the keyword of the day. You can click on any of the Twtter Dots displayed on the map to read the Tweet displayed.
The Twitter Dots blog has also done a little analysis of some of the data produced by the maps. This analysis includes a video looking at the distribution of Tweets mentioning 'good morning' over 24 hours and another video displaying the distribution of tweets mentioning Mubarak on Feb 10th.