Radio 4 is broadcasting a reading of a new translation of Niccolo Machiavelli's The Prince (trans. Constantine) this week 7th-11 January (you can find more details here including how to listen online for up to a week after the broadcast).
I also wrote a piece for The Independent in 2000 'Dead Philosophers' Society' in which I discussed the continuing relevance of Machiavelli.
Finally, Google Books have put most of a chapter I wrote about Machiavelli's Prince from the book Reading Political Philosophy: Machiavelli to Mill online here.
The best short introduction to Machiavelli by far is Quentin Skinner's Machiavelli: A Very Short Introduction. Quentin Skinner is also on an In Our Time programme about Machiavelli that you should be able to access here.I also recommend Isaiah Berlin's essay 'The Originality of Machiavelli' which is in his excellent collection The Proper Study of Mankind (for further details about both books see below).