phasr is a geospatial, cloud-based mashup which combines some of the newest web technologies. It is build upon HTML5, Grails, Twitter Bootstrap, Google Fusion Tables, Cloudfoundry and ESRI's GeoServices REST Specification.
Just drag & drop a GPX track from your local computer onto the map and start playing around. The tracks will stored in a public Fusion Table.
Start playing around with the track reduce function. And see what happens. More to come.