In general, start with the
MacRumors Guide: Helpful Development Resources.
My favorite starting points (being recently new to the development game myself), are
Cocoa Dev Central and Apple's own
Developer site, specifically the section on
Objective-C. As for books, unless there is a secret revision coming, I don't think there is anything in print on Obj-C 2.0 yet, but there are plenty of tried and true books on the language as it stands today. Kochan's
Programming in Objective-C was a good place for me since it had been a while since I had done any programming. if I had been more proficient, Hillegass'
Cocoa Programming for OS X would have been a better starting point (as a CSci student, I have a feeling that is more in line with your situation). After I got going, having the
C in a Nutshell and
Cocoa in a Nutshell books handy was a real help, although the Cocoa book is a little old. After Leopard, I have a feeling these books might all be in real trouble, but if you're just getting started, that's not a big issue.
Also, if you don't already have a good comfort level with the Terminal and Unix on the Mac, I highly recommend
Learning Unix for Mac OS X Tiger by Taylor. Again, a book that might be in need of a new edition pretty soon, but all around a great book. I hope this helps.