Microsoft has published a technology overview on Internet Explorer 7 Beta 2

Internet Explorer 7 Beta 2 includes advancements in security and browsing experience for end users, functionality and compatibility for developers, and manageability for corporate network administrators. Beta 2 is intended to enable developers, web developers and IT pros to begin to test the new browser for compatibility with their applications and websites. Read the Technology Overview to learn more.

Technology Overview: Internet Explorer 7 Beta 2