IE 8 Beta is out with new features like activities and web slices. Apparently developer tools are integrated in the new explorer. There is a also a way to emulate IE7 with IE8 which was something really missing in IE 7.
I think IE 7.0 was already a step forward by Miscrosoft making it much more stable. Lets hope that the new version will be even better.
Web slices is surely a feature that I would be looking forward to test.