Somewhere else I posted that I also do my own labels. It's honestly my favorite part. I take too long on my own though, because I DO like to play.
Editable pdf files would be good, I think, for someone who needs a statically designed label but needs a field where they can edit info & type it so it still looks nice. I have found that writing things in can be difficult simply because of the small real estate space on the labels.
I currently design with Photoshop and just print on sticker paper but someday I will get some from Online Labels, if nothing else than just because I like the clear ones, and want to see how a label turns out with a background image that has lowered opacity on the clear labels.
I intend to test those little buggers to their fullest extent!