Haha. I use Latex a lot for work. What's sad is that I've found it's really easier to print labels with it than any gui program I've tried. I just take the address list that Ruediger sends, strip out the 'APUG name:' lines, and I'm done. The latex file itself is about 19 lines and I can reuse it each round; I just have to replace the address list file's contents.
I was using pearLabelizer for a while, but you had to drag in each address by hand (ugh). I never really looked at doing a mail merge kind of thing with Excel, etc. Heck, I don't even have Office on my computer.