1) Log4J is the only way to put runtime logging output into your app. It's slick, configurable and very, very easy. Oh, and if you use Tapestry, the built-in Tapestry Inspector allows you to configure Log4J on the fly.
2) JUnit is the balls. Just get diciplined and write a bunch of quick tests to go with your code. Easy as cake.
FOAF updates: Trust rankings are now exported, making the data available to other users and websites. An external FOAF URI has been added, allowing users to link to an additional FOAF file.
Keep up with the latest Advogato features by reading the Advogato status blog.
If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!