I recently have been playing with parsing GPX files and spitting out the results into a special KML file. I initially wrote a parser using minidom, yet after running this the first time – and my Core2Duo laptop reaching 100% utilization for 10 seconds – I realized I needed to re-write it using something else. I spent a little time reading the different parsers for XML and eventually read more about cElementTree. And it is included with Python2.5, sweet.