Better Safe Than Sorry

While browsing the web, users will be able to easily discover RSS feeds through an illuminated icon, as well as read the feed while still in the web browser. Additionally, users will be able to subscribe to an RSS feed as easily as adding a web page as a favorite. Once a user chooses to subscribe to a feed, the fact that the user has subscribed is available to any interested application.

Uh-huh. How long will it take until some nasty script automatically and in the background subscribes me to ad-driven crap that proceedes to infiltrate to my other interested applications?

Unless the security of Internet Explorer + Longhorn is substantially improved there is no way in hell I'm letting this loose on my system.