Low hanging fruit / entry point for new developers to the core

Hi there, The recent suhosin 'discussions' and subsequent browsing of various mailing lists prompted me into looking at doing some core development/bug fixing/whatever, since I have a vested interest as a user. I had a look around the various php.net sites but didn't really find much in the way of guidelines to get involved, code wise, or suggestions as to low hanging fruit that wouldn't be too painful to start on. If someone could point me in the right direction it would be much appreciated. Would also be of use to know what automated (or otherwise) testing procedures are available for pre-commit checking? -- Regards, Miah