Yes their site is down, atm.
I notice it as well. I hope they aren't running with the money or anything.
Lets hope its just temporary
*Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Apache Server at
www.butterflylabs.com Port 80*