I’m listing some good URLs that I use for SEO. They are as follows:

Check Redirection Code – For best SEO results, it’s best if you use a HTTP code of 301 when redirection one page to another. 301 is “permanent redirect.” This tool tells you what code the page you submit returns. Useful to troubleshoot pages in your site you have created already. Another tool to check Redirection is from SEO Logic.

Link popularity check – is one of the best ways to quantifiably and independently measure your website’s online awareness and overall visibility. Simply put, link popularity refers to the total number of links or “votes” that a search engine has found for your website.

Search Engine Saturation – simply refers to the number of pages a given search engine has in its index for your website domain. Not all search engines report this information but enough of them do to create some meaningful benchmarks for your search engine marketing campaigns.

Tools out there, including the Google toolbar, may use the same PageRank algorithm, but may fetch outdated results because they get the data from different Google data centers. This may explain the reason for different page ranks you may get from the same page.

Here’s more information from www.web-wise-wizard.com:

Google PageRank™ Complexities

Before we proceed it might be useful to say a few words about Google PageRank. A factor that is likely to confuse anyone who is new to Google PageRank is that there are effectively four different types of Google PageRank, Real PageRank, Toolbar PageRank, Toolbar Display and Directory PageRank. Adding to the confusion is the fact that Google has a large number of data centers scattered around the World that contain the PageRank databases and these databases are very rarely in sync with each other. This means that you will regularly get conflicting results returned by different data centers for the same PageRank query. Of the four different types of Google PageRank, Real PageRank is arguably the most important by far.

More information

Retrieving the PageRank from Different Datacenters

One can check the status of a PageRank on various Google data centers by visiting: http://livepr.raketforskning.com

Google Page Rank Has Been Updated

There’s talk in the SEO blogworld that Google has changed their PageRanks and it may take a while to propagate on all datacenters around the world.

From Problogger.net.

Google Page Rank Update Underway

Tim just alerted me to the fact that it seems Google are doing one of it’s periodic Page Rank Updates. These updates take a little while to show up on all data-centers around the world so it could take a day or two to shakedown – but you can read more about it in Digital Point’s PR Update has begun discussion and at WMW’s PR update Started.

Being a blog, this information is taken with a grain of salt, so it’s unclear how long (one day, one month, a few months) for the data to synchronize on all Google servers.

Here are more blog posts and pages about this PageRank Update. It also includes posts from what other people saying about it:

Watchout, Google is updating their DB

Did Google Change Rankings?

SEO Updates – Google PageRank Updates Feb 05

Google PageRank Updates Feb 05