KBooru
KDE4 Danbooru utility
http://gitorious.org/projects/kbooru

Only feature:
Apply tags (read from rename.txt) to wallpapers in a given directory.

Requeriments:
ruby
ruby standard lib
korundum (with nepomuk bindings)

TODO:
More features!
Check compatibility with the other *boorus

Screenshots:
http://img516.imageshack.us/img516/7282/konalogtt6.jpg
http://img384.imageshack.us/img384/3860/clannadtagsms4.jpg