I use the Alton Brown recipe that others referenced above, but I add a little Kikkoman Teryaki glaze to the marinade, and bump up the heat with dried red pepper. I always use flank steak, but I'm sure that there are other cuts that work just as well.
I use a dehydrator, and they are relatively inexpensive-I think I paid less that 30$ for mine. I load up the trays, rotate them every so often, and remove the product when its done to my liking.
In contrast, the pleated 3M filters that Alton uses aren't the 99 cent variety-I think they cost around 10$ each!