This is an odd error that I have never seen before:
Got error 28 from storage engine
As it turns out on a shared server after a scheduled backup at 2AM in the morning the /tmp folder becomes full and causes this error.
The server admin told me that this happens about once a week at CrystalTech. He said it is mostly due to some screwed up database and after the backup occurs the temporary folder becomes full.
I never ask but I am sure he is referring to the Coldfusion tmp folder because on my SolarDave.com site where it happened this morning PHP WordPress pages worked fine but only the Coldfusion pages pulled an error on more complicated queries. (happened only on my city CF pages and not the state pages)