Hey does anyone know if John has ever written with Huey Lewis? I know that John's a big Huey Lewis & The News fan and I read something a while back suggesting they had written together but that may not have been true...anyone?
(I wish huey would have invited John to play guitar on the Pineapple Express theme song...but anyway)

No he has not.

This is a list of all the people he has worked with.

http://www.j-mayer.org/career/collaborations/