there's no ping list, and due to the tiny additional work involved (and the fact that I'm lazy), there may not be. But if getting pinged to my (or others') new posts in this topic and perhaps others appeals to you, FReepmail me. Here's the fancy @#$%! logo, which I whipped up using some free space art and some font from Mac OS X. The link just goes off to the xplanets keyword.
Here's the small version of the logo, which may be what I'd use for pings to other topics:
