In my view the global anti-war movement was a good example of the kind of new international that Derrida was referring to. It made use of, rather than being tripped up by, sophisticated technologies of representation and communication. It was neither global nor local, and also both global and local at the same time. Etc. These are the most banal ways that the movements can be read against _Spectres_. I'm sure others with better knowledge of the movements could do much more.
I don't know that I'd recommend a book of Derrida's. No, actually, _Limited Inc_ pretty much gives you the gist of much of his work on language and writing. One of my favorite things was an interview he did called "Eating Well," in _Who Comes After the Subject?_. I thought _The Post Card_ and _Glas_ were good, if you want books. The first are essays on psychoanalysis; the second on Hegel and Genet.
Christian