As you will no doubt be aware, Internet Explorer 7 has been going through the beta stages for a while now, and with Release Candidate 1 fresh on the scene, Microsoft hopes that this will indeed be the last test release before the launch later this year.
CNet News has a great feature on the RC1 release, which will be available as a free download (legitimate copy of Windows required). With regards to what's new in IE7, the article states "Among the key enhancements are tabbed browsing, security enhancements and better compatibility with Web standards ... In part because of the security changes, Microsoft plans to push out IE7 as a "high-priority" update to Windows XP. The company is also releasing a tool that will allow businesses to block the upgrade if they wish"
Steve Clayton has located an excellent piece on eWeek, which shows images of the new security features in IE7. Steve also talks about the 'Safe Button' which provides an instant 'return to secure defaults' at the click of the mouse. Great news for all you tinkerers out there!
Partner in crime, Mr Senior also has a great post on IE7, but in this case, he talks about some of the CSS Fixes in IE7. If you are web developer, it would be well worth checking it out.
Go Do - Download the RC1 of Windows Internet Explorer!