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http://www.eclipse.org/eclipselink/ EclipseLink
http://java.sun.com/developer/technicalArticles/J2SE/Desktop/persistenceapi/ Using the Java Persistence API in Desktop Applications
http://www.ibm.com/developerworks/java/library/j-typesafejpa/index.html Dynamic, typesafe queries in JPA 2.0 using the Criteria API
Eclipse RCP Training Join my Eclipse RCP Training to become an RCP Expert in 5 days (Training in German)
Android Tutorial Introduction to Android Programming
GWT Tutorial Program in Java and compile to JavaScript and HTML
Eclipse RCP Tutorial Create native applications in Java
JUnit Tutorial Test your application
Git Tutorial Put everything you have under distributed version control system