See some great Kudos about db4o:
- "Hibernate to db4o is like CP/M to Windows NT"
- "db4o is the easiest database I have ever used, and it have shortened development times by many orders"
- "Has Gavin ever used db4o? It would really open his eyes"
- "I wish Sun adopted db4o and made it part of the basic package. A lot of programmer headaches would go away"
on this thread: http://www.artima.com/forums/flat.jsp?forum=276&thread=206671
Enjoy!