phranque - 4:08 am on Sep 14, 2010 (gmt 0)
the short t.co url will only necessarily survive within the walled garden of twitter.
when the browser requests the new location, that redirected url is what will be displayed in the address bar and is what will more likely be copied and shared than the t.co link in the tweet.
this will be especially true if the wrapped link is displayed in the tweet as one of the many formats described such as a partial url or page title instead of the t.co url or full original url.
there will probably be a backlash in FB and other social sites and sharing apps where they will deconstruct and probably "rewrap" any t.co links that are posted.
the real backlash will occur when twitter start unilaterally changing #coffee to #Charbucks