I've used the sheet metal screws in previous years, but as noted in Matt's article, they do tend to come out fairly easily. I recently came across a more specific product called
IceSpikes, but haven't tried them yet. I've been told that EMS carries them, so I may give them a try.
A couple of the guys I run with use the
Kahtoola Microspikes and like them, but they seem a little too much for me.