I have three of those kinds of Dymo labelers, two older ones (Turbo) that I have hooked up to PC systems, and one (400) that I have hooked up to my Mac powerbook. I use them all quite a bit - addresses, naturally, but I think my most common use is for file labels. I just use the address labels and am able to put several lines of info on them. Really helps when I'm tracking down a specific article.

I also have the receipt paper and print out lists when I need them. (Not that often, but it's fun to have a list on a small piece of paper that I don't have to figure out my handwriting. As far as I've been able to make out, the only way to print on the receipt paper is through Word.)

(I also have a couple of Brother labelers that I use for all sorts of other things, but the file folders are almost always done on the Dymo.)