I'm wondering what adoption rate is of the (now officially supported) ServiceLoader facility in Java 6. I'd like to begin using it as a preferred way to locate dependencies. Obviously this would be made much easier if the jars already ship with with the necessary configuration file in place.
Just poking around I was happy to see the MySQL JDBC driver has the "META-INF/services" in place (at least in v5.1 of mysql-connector-j).
I'd be interested to know what other major/widely used libraries are known to provide this this.