MokoGeocaching is a gtk python script that searches the geogaching.com website for caches near a location. The script can either use a location from the gps or user specified longitude, latitude and range. The found caches is added as poi in tangogps.
If the app won't even start, you may need to install these dependencies manually (Om2008.12):
opkg install python-netclient python-mime python-netclient