Lately my Android phone and my Ubuntu laptop are getting more friendly.

I am a photography enthusiast with Nikon D70s, this camera is not GPS-ready and even if it did I have no intention to buy an expensive GPS attachment. So here's what I did :

1. Install GPS Logger for Android via Market application. This app will log your photo-walk in pre-determined time or distance. The log data stored in SD card in  .GPX and .KML formats.
   
2. Make sure to synchronize the clocks in your camera and your phone first,
3. Start the application and wait until it gets satellites coverage before you take photos, 
4. Download your photos and the .GPX log to your computer,
5. In your computer start your geo-tagging software. Load the photos and the log file, and your photos will be geo-tagged automatically.
   open digiKam, it already includes geotagging application, just go to Image -> Geolocation -> Correlator
6. add the recently shot images and then load the .GPX file, adjust the time difference accordingly -> apply
   
7. Done