You can add tweak to your debian system by putting the following lines into /etc/apt/sources.list:
deb http://cmrg.fifthhorseman.net/~dkg/src/tweak/apt etch main deb-src http://cmrg.fifthhorseman.net/debian unstable
Below, you'll find an older repository that is now deprecated. Please don't use it. i'll remove it as soon as i make sure there are no problems with the transition.