Thanks for the heads up!! Sending a ticket to our support Dream team is generally the best way to get a hold of us
Looking into your domains, found a a few suggestions:
berserkon.com - wp-super-cache is enabled, you may want to use the "mod_rewrite" caching method in the advanced tab for the most in caching
webfora.net/blog - no caching enabled, needs some if that is the traffic site.
forums you will need to see what caching you can do in the admin panels for it
Again for any additional support needed please send us a ticket here https://panel.dreamhost.com/index.cgi?tree=support.msg& and we'll be sure to look into it right away!
almost forgot .. here's a wiki link as well http://wiki.dreamhost.com/Expecting_increased_web_traffic
Hope that helps,