For the most part, I ignore Twitter redesigns, because most of my Tweeting (or Twittering?) is done via either the Tweetdeck app or on my iPhone, i use Echofon (third-party app). But apparently it's a big deal when they redesign, as witnessed by these two videos:
Here's a tour of Twitter by the official Twitter YouTube channel, along with a very annoying soundtrack:
In this second video, the folks at TheVerge offer up their own video tour of the redesign, along with commentary (and less annoying soundtrack).
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