I'm working on a project that will take some Macromedia Flash apps and bend them as much into being fully "508 compliant" for accessibility. This has been an interesting journy on its own, but here is where I'm starting the research for now... screen readers.

I did a basic Google on the topic, which you can play with on your own. For now, it's lead me to a few costly options as well as one that appears free for the initial trial. Thus, that's where I'm starting for now.

Here's a nice Introduction to Screen Readers that has the first list I'm drawing from. The one that caught my eye (again, due to the "free" part) was this one:
ReadPlease

I'll go give that sucker a try and post comments in this thread if I think more info will help.