Pagerank is a value given to the links coming into a web page on a logarithmic scale. So a PR of 2 is 10 times greater than PR 1 and 100 less than PR 4. MozRank has been round a couple of years now and seems to be a decent addition to looking at PageRank. It is updated much more frequently and for some reason is using a scale of 8 instead of 10***, so a PR of 2 is 8 times greater than PR 1 and 100 less than PR 4. MozRank also shows the result to 2 decimal places, which is nice. A PageRank value of 5 could range all the way from 4.5 to 5.49 - those values are almost 100 times different in their magnitude. In the chart below I round MozRank to the nearest tenth of a point.
Now the visible PageRank is just a way of Google letting other people see the relative PageRanks of web pages. The real pagerank Google updates much more frequently. The real pagerank is what is used as a factor in search results. I also believe Google now includes penalties to visible pageranks that are not actually used in their search rankings. So they can show a visible indication that the site is not as highly ranked as it may be (this is most easily noticeable when pages have a reduction in pagerank with no real world explanation).
PageRank matter but is hardly a huge factor. It is much more important to have links from related pages than just high pagerank pages, for being ranked highly in Google search results. And the link text used in links to your pages is very important for how well you rank in search engines. However a link from a page with a PR of 7 would be much better than and a very similar page with a PR of 1. Pagerank "passed" to the linked to page is divided by the total number of links on the page. So if you had a link from a relavent PR 7 page with 10 links that would provide 5 times more "pagerank" than the same PR 7 with 50 links.
In my last post I said "Another thing I have noticed much more over the last few years is having PR for internal pages is much harder." What I have noticed in the last few months is many more internal pages seem to have decent page ranks (very high, above 4, is still fairly rare): lots more internal pages show ranks of 1,2,3 and 4 than I noticed in the last few years You might get the wrong impression from the table below as I picked out the somewhat rare internal pages with decent page ranks to track.
The displayed pagerank is mainly a fun measure, rather than a measure that can be relied on as an important measure. But I still find it fun to look at the pagerank values - except when they go down for my sites :-( Now you can take some solace if your MozRank goes up :-)
For those wondering if I take special Search Engine Optimization (SEO) actions to achieve these results, I don't really. I try to create good content and provide value to users. That is what I did long before I ever heard of SEO. I do include links to my other sites when I think it is worthwhile. My sites are almost all created out of my personal interests (or maybe all, to varying levels, a couple of sites are things that kind of interest me but are maybe more experiments then core interests to me). It isn't surprising they link together in various ways. Again long before I heard of SEO (and the term was even used) I wrote others with web sites on similar topics to share what I offered.
With the advent of blogs, I commented on blogs I read. I do make some effort to try and have sensible urls from an SEO perspective. And I make an additional effort to comment on blogs in order to "market" and SEO reasons. But I do so not by spaming blogs but with thoughtful comments. Those thoughts may be lame, but they are mine, based on the topic and meant to add to the conversation. I doubt I average more than 10 comments a week on blogs. It really is more about adding to the conversation than getting links that some computer reads. Also a few (very few) people reading the thoughtful comments will follow the link to my site and subscribe to RSS feeds, add links to my posts... I occasionally suggest links to blog carnival - probably less than 10 times a year. That is about it.
Check the current pagerank on your sites using our related site: Multiple Site PageRank checker.
* internal pages
** new url as of January 2011, old url forwarded, by Oct 2011 report the pagerank updated
[blank] I don't know what the pagerank was, sometimes the site didn't exist yet.
*** Google doesn't say they use a scale of 10 for the logarithmic PageRank. It seems as good a guess and any and is easier to picture so I use that until we have some new evidence.
Related: Web Page Authority - 6 years Later Goolge Acts To Let Me Block Sites I don't want to see - PageRank Distribution - Google's Search Results - Should Factors Other Than User Value be Used