or
This uses the Nokia Maps API and the Twitter Search API to search for, geocode and display tweets containing any hashtag. The heatmap-style display means that areas with more tweets are more intensely coloured than those fewer.
*because everyone likes dinosaurs
The majority of the code is designed to create the search, process each tweet and geocode. The actual display of tweets as a heatmap is pretty much directly taken from the Nokia Maps API Playground.
The code is thoroughly documented so it should be easy to follow. If you have a questions, just ask on Twitter