People say all the time you can have PR without links to it, but when asked to give an example they never can that I have seen.
No, you can't have a PR page without links pointed to it. You can make it look like it has pr through redirects, or someone could remove their backlinks and still show toolbar PR from the last update, but that's it.
Please, all you guys saying you can, give an example. From what I've seen, tested, and read straight from Google is PR comes directly from links, no other factor can give PR, however other factors can take away PR with penalties.