I visited this website Programming is Hard and was very influenced from the purpose for which it is started. It is public repository for links and code snippets. Use this site to build up your own collection of code snippets, or to give back to everyone.
It is a start, and there are only 4 entries under Java tags which all are quite useful like
Java – Reading XML Files with SAX or DOM using Xerces. Looking forward for great expansion of this community. Yesterday, count of users was 565 and today it is showing as 618 users including me :M) – quite good growth on daily basis.