According to Mario Menti, representative of Twitterfeed, evidently their api requests are still not getting through to Twitter Menti also stated that other sites are being affected as well. Yesterday, Google, Facebook and Youtube were all experiencing trouble.
It seems as a result of the Ddos attack, Twitter’s host started implementing very aggressive IP filtering. Twitterfeed resubmitted their IP addresses and some of their feeds got through, only to come to a screeching halt soon after. Twitterfeed is working with Twitter to resolve these problems but it seems they are not the only web based application that is affected.