I tried to go to the BitInstant website and got:
Website currently unavailable
The website you are trying to access is currently unavailable. Please try again at a later time.
If you are the site owner, here is a help resource to help resolve the issue
by CloudFlare, their DDoS checker...
Website currently unavailable
The website you are trying to access is currently unavailable. Please try again at a later time.
If you are the site owner, here is a help resource to help resolve the issue
by CloudFlare, their DDoS checker...
Yup, we are under attack.
More info: https://bitcointalk.org/index.php?topic=120749.msg1322799#msg1322799
Will post an update soon
-Charlie
Who stands to gain from DDOS-ing bitinstant? 
He sent us an email with a 10,000 BTC ransom.