I had a teacher (classical) who emphasized breathing to help with phrasing--basically breathe as if you were singing the phrase. I still find myself doing that when Im practicing classical pieces. You can hear Edgar Meyer doing it on the Bottesini album. He probably got that from me.
For jazz, I also went through a Slam Stewart phase of singing along with my solos, and I think that helped my phrasing for jazz as well, kind of help extend it more. I still hum and grunt a little when I solo, especially when I dont know the changes.