From the BBC:

Journalists say anonymous sources have helped expose major scandals

Kenyan journalists have staged a silent protest through the streets of the capital against a media law that would compel them to disclose their sources.

Hundreds of journalists taped their mouths and carried placards asking President Mwai Kibaki to reject it.

Kenya's attorney-general on Tuesday pledged to advise the president not to assent the proposed law passed by MPs. ...

"For years journalists in Kenya have been harassed by the government and today we're out to prove that those days are gone and the president has got the message," Frank Ojiambo, an editor with the Daily Nation newspaper told the BBC News website.