Web crawler - spider and Amazon Web Servces (AWS)

I need to create a web crawler and the closest thing to a tutorial
I've found so far is this article:

wich I think I found via RubyInside or some blog.

It uses some of Amazone Web Services, mainly SQS, but this would be my
first time outsourcing a process to a third party and I would like to
know if someone in the group has experience with AWS and what they
think about this kind of architecture.