I built JACK 0.116.1 (with FFADO 2.0~rc1) and Ardour 2.8.2 for Hardy. You can find the .debs in my ppa.
deb http://ppa.launchpad.net/slavender/ppa/ubuntu hardy main
deb-src http://ppa.launchpad.net/slavender/ppa/ubuntu hardy main
And if you don't know how to install software from ppa's:
How do I use software from a PPA?
If you install it and everything works well be sure to add a comment to the appropriate bugs saying so:
LP: 299287 - Please backport Ardour 2.8.2 to Hardy
LP: 312613 - Please backport JACK 0.116 to Hardy
Adding comments to the appropriate bug let's the backporters know the .debs work and can push the fix into hardy-backports for everyone to update.
If you have trouble please post in this thread or contact me on Launchpad: