Internal Server Errors

I've been experiencing some 500 errors on my blog (HTTP Error 500 - Internal server error). During these occasions, the SymCAImport tools seems to work fine, while the Wordpress installment hogs. So PHP screw-ups are less likely.

A brief conversation with the support department @ Dreamhost, suggested a Wordpress theme/plugin malfunction. So I downloaded the latest theme version, and deactivated most plugins. Let see how long thing keep working.
Anyone other ideas?

UPDATE: Got additional information from Dreamhost about the 500 errors. It seems that there was a 'naughty' person clogging up the cluster/server resources.