http://daryl.learnhouston.com/2005/12/14/multi-site-functionality-in-drupal/
http://drupal.org/node/14697
http://drupal.org/node/274
http://drupal.org/node/2622
http://drupal.org/node/22268
http://drupal.org/node/70472
The tables with stars are the tables that we were unsure about...
Unique
accesslog
***blocks
book
***boxes
cache
contact
comments
files
file_revisions
history
menu
node
node_access
node_comment_statistics
node_counter
node_revisions
users_roles - matches user ids to role ids in the role table
**test poll module across multi sites**
poll
poll_choices
poll_votes
system
variable
url_alias
term_node
Shared
access
aggregator_category
aggregator_category_feed
aggregator_category_item
aggregator_feed
aggregator_item
authmap
client
client_system
filters
filter_formats
flood
forum
locales_meta
locales_source
locales_target
role - role id, name of the type of user
permission - role id, permissions to access parts of the site
users
sequences
profile_fields
profile_values
search_dataset
search_index
search_total
sessions
vocabulary
vocabulary_node_types
watchdog
term_data
term_hierarchy
term_relation
term_synonym