Shantonu Sen and I have been working a lot on RPM, and the RPM port in dports. Things are looking pretty good now, I'm doing enough building to have a mock-up of a yum repository (kind of like apt) up and working.
I've got 10 or 12 packages for both ppc and x86 built, and all seems to be going well so far. Feel free to give it a shot and give us feedback, it's starting to look pretty slick!