Matt Cutts, today in his recent video advised publishers to use “rel=canonical” tag

[megri]

Matt Cutts, today in his recent video advised publishers to use “rel=canonical” tag to solve the problem of duplicate contents for similar stories on different URL’s, however seeing the nature of news and publishing websites,

Source

[megri]

Read more detail here on this video

http://www.youtube.com/watch?v=MndQPxmPKDE

If you had to deal with short-term duplicated content on a news site (perhaps publishing a story on two different URLs over one day), what would you do in order to avoid any penalty from a duplicate content filter?