I have burned and erased a few DVD-RW (some older Pioneer Media from work, have not tried others) and it worked without any problems.
I believe others were having the same success with other media also.
Now, what I want to know is if I can (ever?) use DVD-RAM? Supposably the specs on the Panasonic DVD Burner drive inside our Powerbooks can do it, but it has been disabled via firmware. I really hope not.
Chris