Twitter announced the New Twitter today. We are taking the feedly+twitter integration offline for a couple of days to transition to the new twitter @anywhere API. Thank you for your patience.
Update / sept 19th, 2010: we just pushed out feedly 3.x.304 for firefox, safari and chrome. This update offers a new iteration of the feedly + twitter integration based on OAuth and the Twitter REST API and should work all users (old twitter and new twitter). You can get 3.x.304 from http://www.feedly.com