I wrote a SQL file to play with aC on SVN(revision 7).

I checked out /svn/ac/trunk and installed with installation script, but aC didnt work well, some error messages said there were missing columns. It seems that SQL of installation scripts does not create latest schema, and I have to use 'construction.sql' in the root dir of aC to construct latest schema.

I succeeded to setup latest aC in the way below:
- checkout the source
- make 'create-admin.sql' in the root dir of aC

--- create-admin.sql ---
insert into `pm_companies` (`id`, `client_of_id`, `name`, `created_on`, `created_by_id`, `updated_on`, `updated_by_id`)
  values ('1', '0', 'owner_company', NOW(), '1', NOW(), '1');
insert into `pm_users` (`company_id`, `username`, `password`, `email`, `is_admin`, `auto_assign`, `created_on`, `updated_on`)
  values ('1', 'admin', SHA1('admin'), 'admin@dummy.com', '1', '1', NOW(), NOW());
--- create-admin.sql ---

- change dir to the root of aC
- execute following commands(suppose that username for mysql is 'sql_user', and password is 'sql_pass', database for aC is 'db_ac' and db_ac has to be created)

$ mysql -u sql_user --password=sql_pass db_ac < construction.sql
$ mysql -u sql_user --password=sql_pass db_ac < initial_data.sql
$ mysql -u sql_user --password=sql_pass db_ac < create-admin.sql

- edit config/config.php

--- config/config.php ---
<?php
  define('DB_ADAPTER', 'mysql'); 
  define('DB_HOST', 'localhost'); 
  define('DB_USER', 'sql_user'); 
  define('DB_PASS', 'sql_pass'); 
  define('DB_NAME', 'db_ac'); 
  define('DB_PERSIST', true); 
  define('TABLE_PREFIX', 'pm_'); 
  define('ROOT_URL', 'http://ac.ac.ac/ac'); 
  define('DEFAULT_LOCALIZATION', 'en_us'); 
  define('DB_CHARSET', 'utf8'); 
  return true;
?>
--- config/config.php ---
change 'DB_*' and 'ROOT_URL' for your environment, but do not change 'TABLE_PREFIX'.

- hit the url. you will be able to login with username:admin, password:admin.

aC on SVN is not stable (Ilija said) and the way above might have some mistakes, so play at your own risk!