Distributed integer factorization? I'm looking around for publicly published work on factorization of large numbers using distributed systems of any kind. So far I've come across the PDF "Mapreduce for integer factorization" by Javier Tordable" which looks like an interesting read.

Are there any papers in particular that I should be reading?
Last year the paper Factoring as a Service was published, where Amazon EC2 is used to factorize a 512bit RSA modulus in just four hours for $75.
As far as I know, that is currently the fastest/cheapest approach actually used.