Just a few highlights:
Here's the cover of Pagina/12, which also runs a wonderful interview with Estela Carlotto describing how she found out that her grandson had been discovered (via a DNA test).
Here's La Nación, which also reminds us that Guida has not just one grandmother, but two.
Here's the Buenos Aires Herald with an editorial from Robert Cox, talking of "a shining moment in a long struggle" and recalling his personal memories of the Grandmothers.
In English, see also the BBC and on the Guardian you can see a video of Carlotto with subtitles.