Comment 8 for bug 61404

7.0.68~ubuntu2 isn't showing up in dapper-backports via Synaptic yet, but the package is in the archives and works quite nicely with Gdebi :)

http://archive.ubuntu.com/ubuntu/pool/multiverse/f/flashplugin-nonfree/flashplugin-nonfree_7.0.68~ubuntu2_i386.deb

In Gdebi, be sure to click 'Terminal' to be able to say yes to the EULA.