I was doing some tests with IE7 beta today. I have been using it over the last few months and it seems pretty stable.
One of the companies I work for writes a kiosk application. From my expierence all kiosk software technologies use the explorer.exe, by replacing this with their own "secure explorer".
Now something I just realized is that with IE7 (beta) explorer and IE7 are totaly seprated. Meaning you can no longer do searches from any explorer window you opened.
This means that explorer is a totally different "application" then IE7. This is really bad for kiosk software providers. And not a single one of them know this.