Last night I clicked a YouTube link sent by a friend through email. I got a notification window asking me if I wanted to open it in the browser or in the you tube App, along with a check box to always remember my answer. I picked one and hit the check box. Under the box it said if I wanted to change my settings to go to Home > Settings > Applications> Manage Applications to change the behavior. However that specific menu item only contains apps I have downloaded. The YouTube app isn't there, and I had been coming up blank searching for where I can change the setting I chose last night. When you go to Home > Settings > Applications> Manage Applications, by default its filter is set to just the apps you have downloaded, to see all apps on your droid, hit the menu button, and select filter, from here choose All to get to the app whose setting you want to change.