"A story about AI which concludes that they are utterly and forever alien" is Charles Stross' Accelerando. It's a novel made of sequential stories that follow a family through the Singularity and well beyond, and the AI in it becomes something utterly inhuman in terms of thought.

I enjoyed it a lot, and it's a free ebook in addition to something you can get at the library.

Many ebook formats: http://manybooks.net/titles/strosscother05accelerando-txt.ht...

HTML: http://www.jus.uio.no/sisu/accelerando.charles_stross/toc.ht...