I got the Tour today and upgraded from the Pearl. This might be a 3rd party issue, but I'm having trouble with Twitter / TwitterBerry.
My phone is showing "99+" unread Tweets in the top bar of the phone and the red LED is always flashing. My concern is that I don't know how to mark any of the Tweets as "read". I never had to do this with the Pearl. As soon as I opened TwitterBerry, the unread Tweets disappeared from the main BlackBerry unread messages bar and the LED would stop flashing.