Internet Explorer 8.0 is currently available as “RC1” or “Release Candidate 1” (which means it is pretty near final version, much more so than, say, a beta version).
This version of IE is a major new version and has lots to offer developers but also has a lot of implications for web site owners and developers due to some of the bug changes it includes.
My colleague Rainer Maurer has pulled together an excellent collection of links to IE8 resources which I am posting here on his behalf:
What's New in Internet Explorer 8
Internet Explorer 8
Internet Explorer Developer Center
Internet Explorer 8 Readiness Toolkit
IE8 on Channel 9
IE8 Add-ons Gallery
Description of the Compatibility View list in Windows Internet Explorer 8
Some Web sites may not be displayed correctly or work correctly in Windows Internet Explorer 8