About
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Software
This is a simple GUI to upload pics to Flickr from Nautilus file browser (should work with KDE though).
This application is Free Software (GPL version 3) and uses the Flickr API, but is not endorsed or certified by Flickr.
For further information, you can read the developer's blog.

Select the pictures you want to upload to Flickr on you file browser and right click to open them with this application, and you're done. Easy and neat.
How easy? You can check this screencast (version 0.01).
Current stable version is 0.04: Changes
Source code
nautilus-flickr-uploader-0.04.tar.gz (hosted at GitHub)
Read INSTALL file for instructions.
Fedora 11 RPM
nautilus-flickr-uploader-0.04-1.fc11.noarch.rpm
It works with Fedora 12 too.
You can install it with:
su -c "yum --nogpgcheck localinstall nautilus-flickr-uploader-0.04-1.fc11.noarch.rpm"
Fedora 11 Source RPM
nautilus-flickr-uploader-0.04-1.fc11.src.rpm
Ubuntu/Debian DEB
nautilus-flickr-uploader_0.03-1_all.deb
This package has been contributed by Jose Fco. Irles <josefu@gmail.com>.
Note: depends on libxml-parser-lite-tree-perl (>= 0.08), so it should work in Ubuntu Jaunty and Debian Squeeze (or latter).
There's a git repository at GitHub: nautilus-flickr-uploader
You can clone it with:
git clone git://github.com/reidrac/nautilus-flickr-uploader.git
This project uses Transifex to manage the translations, and you can check the project page at transifex.net if you want to contribute.
You can report it at the nautilus-flickr-uploader bug tracking, or just drop me an e-mail.