Twitter has been hacked again and had it's administrative panel (which shouldn't be web accessible) breached.
"This week, unauthorized access to Twitter was gained by an outside
party. Our initial security reviews and investigations indicate that no
account information was altered or removed in any way. However, we
discovered that 10 individual accounts were viewed during this
unauthorized access." – Twitter
Additional screenshots and information on the breach can be found at http://mashable.com/2009/04/30/twitter-admin-panel/
Twitter's Full Statement: http://blog.twitter.com/2009/04/unauthorized-access-update-on-security.html
Additional Reading:
http://www.darkreading.com/blog/archives/2009/05/why_twitter_sec.html
http://www.computerweekly.com/Articles/2009/05/01/235889/hacker-steals-twitter-admin-password.htm
http://irishdev.com/Home/News/479-Twitter-Attacked-by-French-Hacker.html
http://www.informationweek.com/news/internet/social_network/showArticle.jhtml?articleID=217201066&subSection=News