Erm there is no such thing as Mint 9.04 or 9.10
Mint 8 is based on Ubuntu 9.10
Mint 9 is based on Ubuntu 10.04
Mint 10 is based on Ubuntu 10.10
and as far as I'm aware, Mint already uses the Ubuntu repositories.
But yes, Ubuntu PPA's can be added to Mint, if that's the question.
Though I think add-apt-repository is disabled by default in Mint, so you will have to add the PPA to your sources.list manually, using the correct /maverick /lucid etc. at the end.
so for Mint 9, you'd set the distribution as lucid
http://forums.linuxmint.com/viewtopic.p ... 71#p410104