Hi Marco: I'm using a plugin you created, named: Post and Categories index generator in WordPress 3.5.1. You can see it working in the following page of my site: http://www.dequejasyreclamos.com.ar/antecedentes-de-empresas/
The plugin works great, but just one detail: if you scroll down my page, you'll see it has dusplicated its content; i mean, i have the information collected by the plugin twice (two twin lists).
Have you any idea about what's happening?
Thanx a lot!