The lecturer's handouts are like gold. Keep them and make sure you re-read them after the lecture. File them safely with your other materials for that subject. If possible get copies beforehand, perhaps by downloading them from the Internet. It's a good idea to take notes by annotating the handouts.
Some overheads just repeat what the lecturer is saying.
In this case you are better off listening and taking notes from what he or she says. You can often get copies of the overheads from the Internet, from the short term loan section of the Library, or from the lecturer after the lecture. Usually the lecturer will slow down and emphasise a main point, and perhaps put up a new overhead. Write down what you think are the important words and phrases. Experiment with concept maps and diagrams.