We worked on this white paper back at the end of December for AMD. We have significant data that goes along with it, very interesting data, that shows nicely that software and software+hardware accelerated applications can scale. The white paper is here or you can pull it from the AMD site.
There are a few editing mistakes in it, but apart from that, it is an overview of acceleration as it exists today. Feel free to pull it down, read it, comment, etc.