Wuala in too few package managers/repositories?

A major feature of most Linux distributions out there is an integrated package manager that makes installation of programs easy + simple.

Which distributions already support "apt-get/emerge/... wuala" and which don't? Why/why not and what could be done to improve this even more?

I'm sure some distributions will never ever add programs that are not "free" as in free love or whatever but I think an easy integration into many repositories should be something that could come from the community and would really help our penguin-lovers out there as most configuration work etc. wouldn't have to be done by the user.