Sergey Brin's Is The Right Stand
Twitter Blog: Tweets still must flow
The Next Web: Twitter isn't censoring you. Your government is.
technosociology: Why Twitter's new policy is helpful for free-speech advocates
Marketing Land: Twitter Now Able To Censor Tweets, If Required By Law, On A Country-By-Country Basis
Jillian C. York: Thoughts on Twitter's Latest Move
Boing Boing: Twitter caves to global censorship, will block content on country-specific basis as required
Something tells me there is going to be a ruckus.