Following Beni's idea over at slug.ch, blogug's Planet Switzerland now also flags "Sponsored/Paid Content". I choose the term "Publireport" ... They will still show up, there's no option (yet) to turn them completely off.
I really got annoyed by the many many paid articles about the same companies over and over again :)
Update: If you don't want to see them at all anymore, just add ?publireport=off to your URLs (be it for RSS/Atom feeds or just the HTML page), eg: http://planet.blogug.ch/?publireport=off or http://planet.blogug.ch/atom/?publireport=off