Open Source Bridge dubs itself as the conference for open source citizens. It happens June 1-4 2010, in beautiful Portland, Oregon. The young event (it celebrates its second birthday this year), seems to already have a great database track.
From Monty Program Ab, we have Monty himself leading a session on The State of MariaDB. So if you want to go meet the creator of MySQL, the founder of MariaDB, or just taste some Salmiakki vodka, you certainly want to be there at Open Source Bridge.