Walter Rafelsberger from MODUL/University Vienna/Department of New Media Technology is using GeoNames for some interesting and beautyful geo visualisation projects.
Twitter Conversations
The twitter conversation map shows where people talking to each other are located.
Twitter Weather Map
For the Twitter Weather Map the location and weather information twitter users are posting is parsed and visualised:
GeoNames cities over 1000/5mio
GeoNames cities over 1000
GeoNames Blog 