Hi there.
I've written a series of three articles for the spanish edition of Linux Magazine about game development using Gosu (and a little introduction to Boost). The first of them is getting published on the december issue. In the articles I explain how I developed freegemas (
http://code.google.com/p/freegemas/) from scratch.
As you may be aware of, Linux Magazine is one of the most popular magazines about Linux in Europe. There are editions in English, German, Polish, Romanian, Brazilian Portuguese and Spanish. I hope these articles give some fair popularity to Gosu, and the number of users increase.
If they were written in english I'd scan them, but I guess there are not many spanish speakers here.