I'm assuming I can ask CentOS questions in here too, correct? If not, oops!

My question really is pretty basic. I have chosen CentOS to run on one of my workstations basically because of it's simplicity, reliability, and desire for something that is supported with updates for longer than 6 months. However, I really need applications such as K3b and an mp3 compatible music player. Although compiling these from source would be simple enough, I'd really like to have an RPM format to maintain the simplicity. My question is does anyone know of a contrib yum repo that has extra software for CentOS such as the ones I have mentioned?

Thanks in advance,
Greg