Yell - Your Extensible Logging Library has officially hit verion 1.0.0 and you will not want to turn back ;-) Yell features highly customizable log formats (with a no-sweat setup), thread safety, multiple adapters, easy setup from YAML and a nice extendable DSL. Browse the source or have a look at the wiki for further information.

Want to use Yell with Rails? No problem! Want to use Yell with Graylog2? No problem! Want to use Yell with syslog? No problem! Want to write your own Yell adapter? Here you go!