Tweereal uses Google Maps and the Twitter stream to make a live map of public tweets with geolocation available. As soon as you hit the page it starts showing you tweet location around the globe as quick bubbles.
Animation on the map include only tweets containing geo-tags. There are two types of tweets on a map: with the exact coordinates and the coordinates determined with an accuracy of 1 degree
You can use sliders to change some of the settings such as live time, opacity and precision.