I did not follow the Twitter stream on this in real time, but I understand that James Urquhart (@jamesurquhart) proposed creating a list of people who tweet about Cloud Computing and Sam Johnston (@samj) implemented it using TweepML.org. It's a convenient way to find out who tweets about cloud and follow them in bulk.
I created a list like this a while ago, but haven't had time to update it properly, so a community driven list makes a lot of sense. The list is relatively short right now, but seems to be growing quickly via recommendations.
(And don't forget to follow me on Twitter: @gevaperry...)