So - everybody who registers gets 2 databases, one on the MySQL 5.1 server and one on the MySQL 6.0 server, which runs at port 3307. Connections can be made using the MySQL client running the command
mysql -h db4free.net -P 3307 -u [username] -p[password]
or using phpMyAdmin, right from the db4free.net website.
Users who have set their accounts to allow remote connections can also use tools like the MySQL GUI Tools or MySQL Workbench.
Curious about what MySQL 6.0 has new to offer? Check out http://forge.mysql.com/wiki/Falcon_Feature_Preview.
Your feedback about MySQL 6.0 is much appreciated. Please send them to email@example.com or post in the db4free.net forum.
Have fun and enjoy diving into the new MySQL 6.0!