The "tweet this" I see as less interesting than "Read More". I see that the paper already has links - this just makes them clickable. Whether you then read, comment, SMS the link, tweet it - is up to you.

I do like the idea of QR to enhanced content. Click to listen to the interview, watch the trailer for the movie that's reviewed.

It does need to be more than a gimmick - but seeing as newspapers are relegated to printing "yesterday's news" I think this would give them a good way to keep readers up to date.