1st Q of the month – “Why this page has PR 8 when the page is not even crawled by Google?”
The question that came to me was:
How can this page has a PR when there the page even not cached. I checked the page with cache: URL in Google and it shows no cache but the page has a PR, the PR is 8, how is this possible? Is it some black hat technique? How can I achieve it?
Answer as a comment
[Please answer to it and the best answer will be posted as the answer with link to your blog (We all love links 
and the awards). If you don't want your comment to be shown, please mention like that in the comment, so that we don't show it, instead we explain the concept to you]
Update:
Thanks for the answers but that explains some part of it. Still with all the answers it is not clear as in why caching is not important for PR. It will be great if the answer is put with clear examples.
Answer to the question by Aji (24th April, 2010)
Thats for the great answers.
Let’s see what Google says about PR:
“PageRank relies on the uniquely democratic nature of the web by using its vast link structure as an indicator of an individual page’s value. In essence, Google interprets a link from page A to page B as a vote, by page A, for page B. But, Google looks at more than the sheer volume of votes, or links a page receives; it also analyzes the page that casts the vote. Votes cast by pages that are themselves “important” weigh more heavily and help to make other pages “important”.
PR is independent of page’s status, When A links to B, A passes the PR to B (now B gets the PR irrespective of whether B is crawled, indexed, exist or anything else)
(Source: http://www.mattcutts.com/blog/pagerank-sculpting/)
In simple words PR and Web page existence has nothing to do. I guess you can even have a PR for a 404 page.
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1. The basics say that the PR of a page is directly proportional to Googles crawling. But even when the index page is more than pr 0, as Google penetrates more into the pages, with even deeper links, the PR decreases and at a certain point Google stops crawling. The presence of deeper links increases the PR for those pages and so Google continues crawling. the catch here is that once the index page / home page becomes to a threshold or a reasonable value, the presence of deep links do not matter. They do not directly affect the crawling rate. Hence the corollary!
A page does not have to have a cached version available in order to have PageRank.
Method?
If a page is not cached that doesn’t indicate that the page is not crawled. I can have a page crawled and indexed but not cached. There is a big difference between a page in cache (or rather a cached version of the page) and a page in index.
The page can definitely be in Index and have a PR of 8 ( or whatever) and yet not be cached. Try to look up the URL with the site: command in Google and see if the page is indexed – in most likelihood, you will find it indexed.
This may happen when the domain of the page is old but the design is new which has been not crawled by the Google spider till date. This technique can be categorized under black hat SEO technique and in technical terms we can call it as “Page swapping”.
You can optimize a page and when its has good position and PR you can replace it with new page. One serious problem with this technique is that some search engines now reindex pages very quickly, and at the moment it’s impossible to know when the search engines will return.
I just answered it, please do discuss and debate over it.