Little know fact about me: I’ve been installing, setting up, making faster Magento for over 2 years but have never used it as a user. So, I finally installed my own copy of Magento CE 1.7. Some fancy stuff done it:
Changes to Magento’s local.xml:
memcached database 1 1
I use memcached port 11211 for WordPress caches. Always put your Magento cache and session stores in different locations. Clearing the cache will clear the sessions if they are not separate.