The Sun announced it has implemented SecureDrop as well yesterday, along with a strong message against mass surveillance:
http://www.thesun.co.uk/sol/homepage/news/6429126/The-Sun-Wh...
http://www.thesun.co.uk/sol/homepage/news/6429126/The-Sun-Wh...
http://www.thesun.co.uk/sol/homepage/suncolumnists/louisemen...
Surprisingly there was a complete volte-face when it emerged GCHQ were spying on journalists too, perhaps "nothing to hide, nothing to fear" isn't as convincing when you're the one being targeted.
Bit ironic too that this was one of the papers caught up in the phone hacking scandal and they are now preaching about security.