I’d like to volunteer to work on a PPC port of Haiku.
My programming skills are a little rusty (I took 2 years of C++ 5 years ago). But, I’d be willing to give it a shot. I may not be able to write anything advanced, but I’ve got time and patience to help build PPC binaries.
I use a 12" Powerbook G4 that I can’t bring myself to replace…
I used BeOS R5 on a desktop before I switched back to Mac. I loved it, but I jumped ship when the company folded.
Glad to hear you’re motivated to work on the PPC port 
Unfortunately the forums are not a good place to discuss development-related topics currently - the best place you can go is the Haiku Development mailing list.
You can find it on this page labeled “Main Development List”: http://haiku-os.org/community/ml
I suggest you sign up for that list, and reintroduce yourself there. Most of the active developers use that list for their discussions.
Good luck!
I know the new Macs run Intel Hardware but you might want to look into the <a href=http://www.haikuware.com/bounties/">Macbook Support bounty posted on Haikuware.com. If you are able to get that working it could grab you a few bucks for your efforts.