QwertyWEB

Wikipedia describes 

"PageRank is a link analysis algorithm  used by the Google Internet search engine that assigns a numerical weighting to each element of a hyperlinked set of documents, such as the World Wide Web, with the purpose of "measuring" its relative importance within the set. The algorithm may be applied to any collection of entities with reciprocal quotations and references. The numerical weight that it assigns to any given element"

 Microsoft® Office 2010 gives you rich and powerful new ways to deliver your best work - whether you’re at work, home, or school - on a computer, Web browser, or Smartphone.
  Microsoft has offered a free web-based version of its Office productivity suite, known as Office Web Apps, that will debut with the release of Office 2010.

Google Book Search searches the full text of books that Google scans, converts to text and stores in its digital database of over almost 10 million books and still expanding.
Google Book Search allows public-domain works and other out-of-copyright material to be downloaded in PDF format. Where as all the other content is only available for limited preview as per groundbreaking agreement with authors and publishers.

          When the internet 1st started and became public  , weblogs were born and started  growing . When Blogger like services became available and comment option was added , huge spams were produced and reproduced that used to abuse blog , and blog became spam bin of comments which was filled with huge affiliate and filthy , dirty and fake links trying to promote all kinds of junks , gambling and hardcore rated sites.
To combat this, Google implemented the "no follow" tag.

WINRAR:
This award winning software starts by conducting a deep scan of your registry, checking for file extension errors and other registry conflicts.
With RegistryBooster you’ll see immediate increases in performance and decreases in system conflicts.

If you are an active twitterer tweeting n times on twitter , chances are high that someone may try to hack account or report as spam or anything worse .

Blogger (blogspot.com) and Wordpress.com the two main best of choices for free blog hosting. Features which are better at either BlogSpot or Wordpress have been emphasize. You can sign up blogger and wordpress free . Check about this project for a number of converters to and from different Blog services.