> The way I do it if I want an unstable package is to add unstable to my > sources.list, > apt-get update > apt-get install <package> -s > If all looks OK then I go ahead and do it. Sometimes it will want to > upgrade a whole lot of stuff, in which case I don't do it.
What I do is download the source of the package and build it, that always seems to work (only thing that can go wrong are the install-scripts).