I just released Pony v0.2 . It is still under constant development and will go some db changes before v1 release. Please delete .pony.db under your home before using the new release.
Among new features one can now see the EXIF information of an image.
Deleting tag option is also added.
Now I have to add TODO file as too many things need to be fixed. If you have any suggestions please mail me or file a ticket.