APPARENTLY it is CURRENTLY back up Have had no trouble since mid afternoon US Central Time
From the Twitter blog...
Denial of Service Attack
Thursday, August 06, 2009
On this otherwise happy Thursday morning, Twitter is the target of a denial of service attack. Attacks such as this are malicious efforts orchestrated to disrupt and make unavailable services such as online banks, credit card payment gateways, and in this case, Twitter for intended customers or users. We are defending against this attack now and will continue to update our status blog as we continue to defend and later investigate.
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