Microsoft's IE8 - Final version available for download today
At noon EDT, Microsoft will initially offer the final production version of IE8. It represents a further improvement of it's browser technology in terms of security, functionality, and web standards support. Some precautions in installing this immediately include:
-- Read all dialogs and option selections carefully, instead of simply pressing next
-- Be patient in trying to download this during the next couple days, as the site will most likely be saturated with users
-- Experienced users should download this version initially, in case any technical issues surface that might require recovery. It will later be available to everyone through Windows Update.
-- Corporate users may need to wait for official approval, in case there might be incompatible web applications or software. It's always beneficial to lab test any new software release to ensure all applications are certified
However, based on my own beta testing for several months, this new version will most likely be a high quality product. Users who have been actively beta testing should certainly apply the official version right away, as they've worked through any incompatibilities.
So far, this new version is working well in early usage 
Microsoft's IE8 - Final version available for download today
http://www.eweek.com/c/a/Windows/Microsoft-Ships-Internet-Explorer-8-Browser-184414/
Microsoft's IE8 browser offers cool features, better security, and improved performance.
http://www.computerworld.com/action/article.do?command=viewArticleBasic&articleId=9129906
QUOTE: Internet Explorer 8 has shipped in its final version and is ready to take on its rivals. This latest version of Microsoft's browser leapfrogs its closest competition, Firefox 3, for basic browsing and productivity features -- it has better tab handling, a niftier search bar, a more useful address bar, and new tools that deliver information directly from other Web pages and services. IE8 has also been tweaked for security and includes a privacy mode, new anti-malware protection, and better ways to protect your privacy.
CORPORATE USERS -- IEAK allows an enterprise to configure the browser to meet the company's default settings
Internet Explorer Administration Kit 8
http://technet.microsoft.com/en-us/library/cc817437.aspx
Microsoft Download Site
http://www.microsoft.com/windows/Internet-explorer/download-ie.aspx