Giving Back

So I have been giving back to the community by donating some of the plugins that I have developed. I have been to some WordPress Camps and really enjoyed them. At one I even tried sticking around to the giving back speech but had a hard time following it for some reason. So I figured it best to go to the community to ask how to best start becoming more involved with the Core of WordPress. So please let me know of any articles or how best to begin getting involved in either the development of core or testing of things that need to be tested. I thank you for your time.