My repository now contains a steaming ferris-sharing-plugin_0.2_armel.deb which will hook up libferris to the Nokia sharing system on the n900. This lets you click the funky Brussels atom building "sharing" icon from many places and copy images to flickr, 23hq, facebook.
There isn't much feedback at the moment, that is planned for "the future". You might also like to install the ImageMagick from my repo. Simply expand it to /opt and make a link /usr/lib/ImageMagick-6.6.0 -> /opt/ImageMagick-6.6.0/lib/ImageMagick-6.6.0. This gives you proper handling of exif orientation during scaling prior to upload with libferris.
I also have some tweaks to libferris itself which will be in the upcoming 1.5.1 release to help with annotations etc during upload. The next step is to get vimeo and youtube upload support happening too, since libferris can already upload to those.