Bryan: Here's a pretty good list for you.
Windows:
Jaws for Windows (http://freedomscientific.com). Not free, but you get a
40 minute demo before you need to reboot.
Nonvisual Desktop Access: http://www.nvda-project.org/
Free, open source, written in python (with some core stuff in c/c++).
Linux:
Orca live.gnome.org/Orca
Fre, open source. If you don't want to install that bloated mess on a
box (I sympathise), and you can grab a vmware vinux or a live cd or
whatever from:
http://vinux.org.uk
OSX:
OSX comes built in with Voiceover, just hold down the command key and
hit F5. Use the same keystroke to turn it off.
Enjoy!
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