A backport of gnash 0.8.2 is available in my PPA at
deb http://ppa.launchpad.net/juliank/ubuntu gutsy main
I wanted to try it, but I had no time to compile it, so I uploaded it to the PPA. The next day, I had a compiled backport.
I don’t use it actively because it does not support some sites I visit.
Another news is the recent addition of ndisgtk to the ship and ship-live seeds, which means it will be available on the disk. http://bazaar.launchpad.net/~ubuntu-core-dev/ubuntu-seeds/ubuntu.hardy/revision/1223.
BTW, recent Ubuntu Hardy images (including Alpha 6) have support for using aufs instead of unionfs, simply add
union=aufs to the kernel options. It may help if you have problems with unionfs and should be faster and more stable.