1 - i definitely have a query cache config, but I am getting this - "query_cache_type = OFF - FAIL (must be strcasecmp on)" under server audit.

2 - i have zend php accelerator, but am getting this - "PHP accelerator = - WARNING (The script can be much faster if you install some PHP accelerator)" PHP setup = cgi-fcgi - OK

3 - //(do I take the site to regular php, and then zend will cooperate?) as in, cannot use zend and fastcgi at the same time? I am also running memcached.

-cron is emailing mem periodically about php memory being exhausted, unable to allocate. (it's set to 100 megs...)  --- the error::  PHP Fatal error:  Allowed memory size of 94371840 bytes exhausted (tried to allocate 53098415 bytes) in /home/myusername

1 - it maybe you are using some new version of mysql where this option is obsolete

2 - could you please provide link to your php_info page to check what is wrong ?

3 - sorry, it isn't clear what is your question 

4 - 100M maybe too low for some operations, please increase at least up to 128M or better 192M