Ok, I have flash for firefox running now. I did the following:
1) Added backports to my sources.list file:
deb
http://www.backports.org/debian etch-backports main contrib non-free
2) Ran the command: aptitude -t etch-backports install flashplugin-nonfree
I'm still not sure though why the package wasn't found given my earlier sources.list file.
-ab