We just refreshed the IE7 preview build. You can read more about it on the IEBlog at
http://blogs.msdn.com/ie/archive/2006/03/20/555703.aspxThis is essentially the latest and greatest IE7. About a week ago we forked this build off our main development branch and stabilized it for the MIX06 release.
Due to some last minute bug finds & fixes, this is actually newer than the build burned on the MIX06 CD - hence the .5 minor build number.
There are a ton of good bug fixes in this build, including the problems with the HTML editor causing problems with things like the C9 post editor.
Stay tuned to the IEBlog for more news.