First queue:
    - Improve ORM::Error, create ORM::Error::Db
    - Implement multifield properties
    - Implement arbitrary/multified object's ID
    - Autodetect ID from primary key
    - Deny modifying parts of multified IDs
    - Access to database schemes other than default
    - Optimize ORM::Expr:_between
    - Add 'grouping' flag to ORM::Tjoin object, forcing ORM::Db driver to group
      result set by object's id (after it is complete replace 'SELECT DISTINCT' with plain 'SELECT')
    - ORM::Stat::stat method, using subqueries
    - Use transactions in 'new', 'update', 'delete' by default
    - Implement storage drivers:
       - ORM::Db::Backup
       - ORM::Db::Replicated (to work with replicated DB in 'one master many slaves' mode)
       - ORM::Db::DBI::MySQLemTA (emulate transactions for non-transactional MySQL)
       - ORM::Db::Merged (to represent many DBs with the same schemes as one solid DB)
    - Add 'preload' argument to 'find' method
    - Temporary objects support:
      - 'find' and 'new' methods can return temporary objects
      - 'update' and 'delete' don't write to DB for temporary objects
      - 'serialized' returns string containing object content, that string is useful
        to construct object.
      - Add 'make_permanent' object method
      - Add 'make_permanent' class method, to have ability to implement optimized INSERT of many objects
    - ORM::Filter descendants should check its argument types
    - Implement permissions to use ORM::Expr with 'update'
    - Die if '_ORM_refs' table contains information about property missing in class
    - Die if 'filter' argument to 'find' method is not an ORM::Expr
    - Documentation
      - Manual pages
      - Object model example
    - ORM tools
      - Object model web-browsing
      - Create Perl modules and database tables from UML
      - Refactoring tools:
        - move property to descendant class
        - move property to base class
        - create class and its table templates
    - Suspended object creation
      ( Should accept argument 'make_permanent', telling to replace suspended object by permanent one )
    - Cyclic perl references resolution
    - Use of multiple tables for one class (statistics storage)

Second queue:
    - Support temporary tables and views for 'ORM::Stat'
    - Events (Triggers)
    - Tests for ORM::History
    - Initial class configuration:
      - Parameter to enable/disable autoload of descendants classes and property classes
        in 'stat' and 'find' methods, user can rely on Class::Autouse instead.
    - Method stat should autoload descendants classes and property classes
    - Methods 'stat' and 'find' should accept argument telling not to autoload
      descendants classes and property classes
    - Die if 'class' is an empty string
    - Arbitrary field to use as 'class' field
    - lazy_load on per field basis
