I've been reading some of the recent outage messages and I don't believe I have a similar issue.
One of my subdomains has been failing to respond to web requests for the last six hours or so.
It doesn't seem to be similar to the titanic (cough cough) issue. I can FTP in and see everything.
It's certainly not a WordPress issue (not a blog).
Minor changes to htaccess made a few days ago have been removed (the remainder of the file is pretty innocuous).
The error logs seem to show a couple score of entries marked 'Premature end of script headers: /dh/cgi-system/php.cgi', but that doesn't strike me as very many.
There's a six hour gap in my access log followed by about 15 minutes of low-activity, then nothing else.
Any idea what would take down just one subdomain?