I've used, POC, Poplar,Southern Yellow Pine, White Pine, Ash, Ramin,pecan, Locust shoots, and (of course) bamboo/Cane. I always come back to the boo though.
On a side note, I once used some sort of palm shoot (looked sorta like palmetto) to make arrows from when I was in panama as a kid. Course back then I didn't even know enough to let em dry out first.
I just used em green, and talk about heavy shafts, I think a broom stick woulda been lighter. lol They had a nice thick skin on em, were naturally tapered, and easy to get straight. I guess I only used them cause they already looked like arrows. I have often thought that they would make excellent shafts when dried out. If I only knew what they were. Maybe somebody on here knows?