gcc and objective c

The gcc compiler supports objective c as well as standard c, standard c++, fortran 77, lisp, java, etc. Objective c is the c programming language with extensions for object based programming. Does anyone use it, and how do you find it compares with C++ or else standard c that based on object oriented design?

I find that all the instruction on this website on the general c board is based on procedural programming. It would be interesting to see some object oriented c answers and suggestions because I believe that most vendor system implementation is designed to support object based programming using the c langauge.