What MySQL privileges would a read-only drupal db user need I am in the process of configuring a server that will be on the front end and will be the read-only installation.  Can anyone give me some guidance on what to look for for in regards to what tables the mysql user will need write access for... such as like access log, etc.

I am just looking for a starting point. It doesn't need to be specific.
Looking through the core tables of a fairly lean install, these will probably need to be writeable:


access
batch
cache and cache_*
flood
history
node_access
queue
sessions
semaphore
users (for last login date)
watchdog


These I'm not too sure about, worth testing:


registry
registry_file
file_usage
blocked_ips


Contrib modules are different matter, you'll need to look at those one-by-one as it will depend on which ones you use (e.g. ctools has ctools_css_cache and ctools_object_cache)