Oh, I saw that page! I...hmmm, let me check my links...curse it, I found a page some time ago which did panel-by-panel comparisons of stuff like Hikaru no Go, even, and the later parts of JoJo. It was pretty funny!

Also, let's see, other references...um....well, Togushi has said that Hisoka == Dio, in Watsuki's post-Kenshin series Busou Renkin, his hero's stated favorite mangaka in his profile is "Kishibe Rohan" which is Araki's Marty Stu from part 4 (you'll meet him...eventually...BOY IS HE SPECIAL XDDD)