There are many different rss clients, some of them are single programs, some are part of internet browsers. I’m using Feed Daemon. Homepage is http://www.bradsoft.com/. Why Feed Daemon? Well at first it constructed for working with 100, 1000 or more channels. Dividing in groups allows you to make 50 groups with 10 channels and work with 500 channels became easy. Second reason I’m using Feed Daemon is that it have already 18 channels groups with 8-10 channels in each one, so you have all news after installation and don’t need to find them by yourself. Check this client, it’s really good one.