phTagr supports now (simple) geo tagging of the media. Input fields where added to the meta data form and the latitude and longitude values could be entered directly. Additional, the google map shows the current location of the center which could be used through copy’n'paste for the geo input.
So select an image with geo location, open the map and center the map to the location for the new media. Copy the location below the map and insert it into the geo input form.
Happy Geo Tagging!
Update 2009-11-03: A context menu was added to help to navigate through the map, which is opened by the right mouse click. It adds following actions: Zoom in, Zoom out, Zoom in here, and Center here. Especially the last action is helpful to find the correct position!