I read an FAZ article about software repair and bugs in Windows Vista. Following the link, I found a website claiming "automated debugging and software evolution at your fingertips".
Currently there are about 20 different native XML databases on the market. Below, there is a description of seven open source (or at least free) native XML DBs. There are always links going to further informations.
dbXML 2.0 Xindice Berkeley DB XML Ozone eXist Viper SQL 2005 Server Express
Informatics related 
We worked with 