Just another quick tip Magento as I continue my journey into the Swamp of e-commerce.
Magneto’s admin console has a department for the management of your cache
(System-> Cache Management) which works well if you happen to get a bad cached configuration that the system crashes or does the admin inaccessible.
When is happened to me I could completely clear the cache folder, and is smart enough Magento to be “on the fly again
rm -rf var/cache
This will zap all cached values and allow you to fix whatever broke you.
(Based on Alanstorm Turtorial)