Script Summary: Trasforms Google Maps URL to tags wanted by 23hq.com system to place a photo on the map.
Newer version, now works better!
Quick step-by-step:
1) Install Mozilla Firefox
2) Install GreaseMonkey Extension
3) Install GeoTag 23hq greasemonkey Script
4) Search with Google Maps your favourite location
5) Click on "Link to this page" top right in Google Maps
6) Copy first URL (Ctrl+c or Cmd+c)
7) Paste (Ctrl+v or Cmd+v) this URL in photo you want to GeoTag
8) Click on the input field, a new button will appear below Save and Cancel
9) Click on the new Button "get GeoTags by Gmaps"
10) your input text will trasform to something like geo:lat=XX.XXXX,geo:long=XX.XXXX
11) Click button Save
12) your geoTags will be added to your photo
