I have been doing the same arm workout for over 15 years now - 3 sets of 15 curls, 3 sets of 15 presses, 3 sets of 15 extensions, and 3 sets of 15 lat pull downs. I'm now bored of the workout ... the problem is I got so bored of it, I stopped doing arms. I do not want arms that wave after me, though, so this weekend I invested in a kettlebell which I am now in love with.
When I first got the Kettlebell I didn't fully know what to do with it. I did a couple swinging movements and tried to mimic the pics on the box (dangerous). Here's a great video that gives a good simple workout:
Good and simple but tiring!