Worldlabel.com is a printer label supplier in the US who is heavily into using and promoting Open Source. They have a blog too, where they just have published an excellent article by Nathan Willis about printing in GIMP. Nathan did also a good writeup about the state of Photography under Open Source some weeks ago.
It’s no fault to check out the other blog posts and informations too, I found a HowTo about Open Office especially helpful.
(With the pointer to this blog I received also a donation of 30€ from the owner of Worldlabel for helping to cover the costs of Meet the GIMP. There were no conditions to this donation, he didn’t ask for linking to his site or blog.)