Label printer recomendations?

pdkl95 writes: "I have been using some small, simple desktop label printers for quite a while now. Unfortunately, it's rapidly becoming clear that my printing needs are for something far more "industrial strength". Several of the label printers have failed, and they never really had the management features I wanted.
So, does anybody have recommendations on label printers, that can hold up to a quite heavy load? The catch is that I'm printing to them from CUPS under Linux, and it seems like specialty-printers are a windows-centric field."