Long time listener, first time caller.
I recently started the Glome Wiki (http://www.ludism.org/glome) for freewheeling discussions and data about both higher and lower dimensions (as opposed to merely lists of regular polychora, etc. -- not that there's anything wrong with that).
There's not much there yet (June 2009), but we do have a page on names for the 4D equivalents of pitch, roll, and yaw, as well as the beginnings of a glossary for A.K. Dewdney's book The Planiverse. I also plan to use the wiki as a kind of scratch pad for the material on higher dimensional geometry I'm including in my next book, Mind Agility Hacks, the sequel to Mind Performance Hacks (http://oreilly.com/catalog/9780596101534/).
Please come visit, and help build the wiki. There's no place like Glome.