> Does anyone know of any other incidents that make case against centralized servers?

Yes. Many of these are undemocratic, but others are merely unintentional problems of reliability induced by a single point of failure.

http://www.delicious.com/kragen/decentralization-stories has a few dozen items up through 2008.

http://beckyzoole.livejournal.com/395310.html
livejournal users want more control of livejournal. decentralization-stories

omg decentralization-stories:
http://www.chrisbrogan.com/when-google-owns-you/
http://www.chrisbrogan.com/google-gets-back-to-nick/

http://valleywag.com/5053704/kentucky-judge-moves-to-seize-g...
more decentralization-stories: caribbeangold.com, etc., censored

http://news.ycombinator.com/item?id=341378
more decentralization-stories: legal intimidation takes a site offline

http://blog.wikiring.com/Blog/BlogEntry28
decentralization-stories: the TWiki Takeover

http://norayounis.com/2008/11/04/308
The impressive flickr account of blogger and friend Hossam el-Hamalawy
is facing censorship by flickr themselves! First they disabled
pro-palestine photos he had taken in Ireland, then they started
searching their old drawers for reasons to un-list his account from
public search.
decentralization-stories

http://arabist.net/arabawy/2008/11/04/flick-censors-my-accou...
more details. ugly. decentralization-stories

http://globalvoicesonline.org/2008/11/05/support-the-arabist...
global voices picks it up.

http://www.worldchanging.com/archives/009100.html
The most credible voice in the Ossetian war, he tells us, was a
Georgian blogger who’d fled Abkhazia for Russia. His LiveJournal
account was highly critical both of Moscow and of Sakashvili, and was
widely read in the Russian blogosphere. But a flurry of denial of
service attacks, launched by a set of zombie computers likely
controlled by Russian hackers, disabled LiveJournal for an hour, and
forced the owners of LiveJournal to ask the blogger to leave the
service so that future attacks wouldn’t take down the platform. He
moved to Wordpress, but had the same experience. If governments are
able to unleash attacks that can disable whole platforms, it’s likely
that they’ll successfully silence many online voices.
decentralization-stories

http://elphabawest.blogspot.com/2008/12/microsoft-live-has-n...
Microsoft Live blogging used to support anonymous commenting, but they
were tracking the commenters’ identity --- and when they turned off
anonymous commenting, all the previously-anonymous comments became
non-anonymous. decentralization-stories

http://ascii.textfiles.com/archives/1617
Eviction, or the Coming Datapocalypse
(AOL deleted a lot of people's web pages with scant 4 weeks' warning)
decentralization-stories

http://torrentfreak.com/facebook-blocks-all-pirate-bay-links...
decentralization-stories about one social site blocking all links to another.

http://ejohn.org/blog/google-groups-is-dead/
more decentralization-stories: resig is moving public discussion of
jQuery off Google Groups

http://www.guardian.co.uk/technology/2009/sep/02/cory-doctor...
anti. decentralization-stories.

http://www.publicschoolreview.com/articles/198
The Lower Merion School District used laptops with webcams to spy on children in
their homes. decentralization-stories

http://highscalability.com/blog/2010/1/25/lets-welcome-our-n...
decentralization-stories about cloud computing

http://www.mikechambers.com/blog/2010/04/20/on-adobe-flash-c...
decentralization-stories about how Adobe doesn’t want to do anything for the iPhone

http://andreyf.tumblr.com/post/538652366/info-roundup-mcafee...
decentralization-stories about virus scanning and “bad code” identification
http://news.ycombinator.com/item?id=1282791
discussion thereof

http://my.opera.com/unite/blog/2009/07/14/fixing-proxy-probl...
decentralization-stories: Opera Unite was down for days because it
depended on centralized proxies

http://www.itwriting.com/blog/2647-itunes-user-has-account-h...
decentralization-stories: a guy’s account got closed after someone
broke into it, and he lost all of his previous six years of iTunes
purchases.

http://www.jonobacon.org/2010/03/26/facebook-account-disable...
decentralization-stories
http://blogs.gnome.org/rodrigo/2010/03/26/facebook-account-d...
decentralization-stories

http://blog.ericgoldman.org/personal/archives/2010/09/scribd...
decentralization-stories: scribd changes its terms

http://mobilized.allthingsd.com/20110228/t-mobile-killing-of...
decentralization-stories: the hiptop/sidekick will be bricked.

http://e1ven.com/2011/04/14/why-no-company-that-values-their...
decentralization-stories. in this case google just broke some things, that’s all.

https://www.eff.org/deeplinks/2011/04/googles-lack-transpera...
Earlier this month, Google removed Grooveshark’s popular app from the Android Market for violation of the Android terms of service, later informing Grooveshark that the removal was related to a “complaint from the RIAA" but nevertheless refusing to provide an actual legal or policy basis for the takedown.

http://www.theatlantic.com/technology/archive/2011/08/why-fa...
Why Facebook and Google's Concept of 'Real Names' Is Revolutionary - Alexis Madrigal - Technology - The Atlantic A bit of a #decentralization-stories item, maybe.