Due to some comment spam on a very old post I noticed a valid comment posted 3 years ago :)
This comment is asking why I'm not using flickr_upload inside gThumb. Actually I am, but with an ugly hack as I could not find a plugin API (this was 3 years ago, maybe there is a nice one now).
[pterjan@plop ~]$ cat /usr/local/share/applications/flickr_upload.desktop [Desktop Entry] Version=1.0 Encoding=UTF-8 Type=Application Name=Flickr Uploader GenericName=Flickr Uploader Comment=Upload pictures to your Flickr account Exec=flickr_upload %F Icon=Flickr Terminal=false Categories=Graphics;2DGraphics;RasterGraphics; StartupNotify=false MimeType=image/gif;image/jpeg;image/jpg;image/png;image/tiff; X-Desktop-File-Install-Version=0.11 NoDisplay=true
And then to upload I select some images, and use "Open with" > "Flickr Uploader". The nice part is that it also work from other apps, like nautilus. The bad part is that there is no interface for feedback so maybe I'll switch to one of the Gtk uploaders, I have read several posts about one on the planet.