Wizards of the Coast announced today that the format known as Extended will no longer be supported by Magic: the Gathering. In their news article, they say:
"As the popularity of Modern has continued to rise, Wizards of the Coast has made the decision to retire the Extended format. Too many formats can fracture a player base, so we’ve decided to focus efforts on our other Constructed formats."
To see the full announcement, click the story on DailyMTG.com.