"Premature end of script headers" shows up a lot in my error logs. The referrer varies from index.php for public facings pages to post-new.php and admin-ajax.php for admin tasks.
I contacted Dreamhost about the issue and they came back with the following:
I took a look, and it looks like your scripts are still getting killed by
our procwatch daemon for using too much RAM, which is what helps keep
users from affecting others on their shared server.
2010-10-05 21:45:10 procwatch2 INFO: Process(pid=28716, name='php5.cgi',
uid=kingkool68(702960), tty=None: kill for total RAM
So it looks like I need to reduce WordPress' appetite for RAM.
