We are simply running out of memory, which is sad because we are nowhere near running out of processor and it grieves me to simply use a bigger server when it seems that smarter could solve the problem. Other than that things are working very nicely and the site serves quickly and reliably - see at www.superquote.com ( despite the warnings that ithreads is not yet safe for commercial use ).
You might want to have a look at my forks.pm module if you have CPU to spare and wouldn't suffer from extra latency in communication between threads. And you wouldn't need a threaded Perl, which would save you some % of CPU usage.
Liz
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