Recently I came across db4o (www.db4o.com), an object oriented DBMS. Quite nice, no relational mapping just pure OO. db4o comes in two flavors - Java or C# libs. For the Java libs there are 4 sub-categories. Talk about choice.
Having worked with C-JDBC (currently Sequoia) I have pretty high expectations of a DBMS. From the feature list db4o seems to meet all of them (distributed replication and fallover with no loss of data).
To determine how well db4o interacts with Scala I started rewriting the Java examples in Scala. The next series of posts will highlight this.
http://northernchime.blogspot.com/2007/05/db4o-and-scala.html