Java Reference
I heard about this site the other day when listening to the Java Posse. The site is called simply JavaReference. The site contents so much information about Java programming that I find myself going to it constantly now for both news and reference information while I'm coding. Also, there is a cool feature that I have not really played with yet but may soon called Test Center. This section of the site allows folks to take practice tests for exams they might be practicing for when trying to gain certification. Someone could always go to JavaBlackBelt to gain a free certification there but here it is free and readily available as well. The more the merrier I guess as far as practice tests go when trying to get a certificate. Overall I think this site is pretty good.