New look of resultset, WebRowSet, http://www.onjava.com/lpt/a/6633 , but I personally don't think this is something useful

Some information how using jmxagent: http://weblogs.java.net/blog/emcmanus/archive/2006/06/going_beyond_jd.html

Just come across a nice article that discuss about various new features of 1.5 and provide tips on how to use them: http://java.sys-con.com/read/171487_p.htm

Create collection quick

List<String> programmingLanguages = CollectionUtils.newList("Java", "C++", "Ruby");

Or this: 

Map<String, String> langs = new HashMap<String, String>(3) {{
    put("Java", "Wicked");
    put("C++", "Ok");
    put("Ruby", "Interesting");
}};

http://www.theserverside.com/blogs/thread.tss?thread_id=37839