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I'm guessing I'll never get to a PR7 until I have a few PR7's and/or PR8's pointing to me...
Does that about sum it up? Isn't it much more difficult for people to get recip links from PR7-8 pages, especially themed, relevant pages? I guess that's the whole challenge that makes high PR so hard to get.
Added Value!
Developing something in your site that others would most certainly want to link to.
In addition, this can reverse the PR flow so that a deeplink in your site is pushing PR up through your hierarchy rather than being just a drain.
Something of educational value has alot of merit, along the line of "how to" and this can easy produce a new DMOZ/Google/AOL etc., backlinks maybe in "Kids and Teens" sections.
Note: DMOZ has been adding many new sub-categories of late.