Drupal 7 major database differences

I found some major differences in Drupal 7 database with Drupal 6 as described below in short:

Database 

• Master/slave concept may be used for more than one databases
• By default engine: Innodb

Cache 

• There are more tables like cache_bootstrap, cache_field, cache_image, cache_update.

Comment 

• New column "language"
• Field API concept has been used

Field

• field_config - The field_config table stores field configuration information.
• field_config_instance -The field_config_instance table stores field configuration information.
• field_data_body - The field_data_body table stores details about the body field of an entity.
• field_revision_body - The field_revision_body table stores information about revisions to body fields.

Flood 

• flood - The flood table controls the threshold of events, such as the number of contact attempts.
• expiration int - New column  "Expiration timestamp, expired events are purged on cron run.

Files

• files_managed - The files_managed table stores information about uploaded files.
• file_usage - The file_usage table stores information for tracking where a file is used.

Images

• image_styles  - The image_styles table stores configuration options for image styles.
• image_effects  - The table stores configuration options for image effects.

Node

• node - node table is almost same
• field api concept has been used.

Session

• ssid - New column in "session" table : Secure session ID; the value is generated by PHP’s Session API.

Taxonomy

• Some difference in name of tables only 
• field api concept has been used.

User

• init - A field in "users" table saves E-mail address used for initial account creation
• field api concept has been used.

Request: If any developer find any other major difference, please comment.