Question: What would be the easiest way to view classes, methods, properties, etc. inside a jar file?
I'm looking for something equivalent to the very useful  *Lutz Roeder .NET Reflector*  - for Java

Answer: 
I prefer [JAR Browser](http://jarbrowser.sourceforge.net/), it has a simple interface where you can browse multiple JARs, and search for a specific class across multiple JARs simultaneously.
`java -xf some-j.jar` will unzip a JAR file.