La gente de IBM nos manda una relación de ligas y referencias para todos aquellos que quieran incursionar en la programación de Java:
This article presents a vast list of the key resources any up-and-coming Java developer should have. To avoid the appearance of bias or undue influence, I decided to throw a call to the blogosphere for resources: Web sites, conferences, books, blogs, tools, anything that seemed like it would be of interest and use to Java developers. As with any kind of list of this sort, there is always room for reasonable debate as to what should be included that wasn’t or what was included that shouldn’t have been. Thats where you come in – help scrub this list down or up to the right size.