Thanks Rob, I got confused because my logic tells me that if there's a 1.20 good for download, it's probable that there's also a .deb package awaiting, but I forget how linux world depends on lots of collaborations and one shouldn't take things for granted. Cheers.
Did you get it installed?
1.2.1 is now out as a Debian package:
http://sourceforge.net/projects/amdovdrvctrl/files/deb%20binaries/I was able to install it with:
$ sudo dpkg -i amdoverdrivectrl_1.2.1_amd64.deb
$ sudo apt-get -f install
Ignore the errors you'll see from the first command, just run the second.