RSS and ATOM feeds dominate the syndication systems today. If you run a web site you probably use RSS and ATOM for two purposes:
1) Expose your site content for syndication using these formats
2) Consume content exposed by other web sites and aggregate it on your web site
Whatever be the case until recently developers either coded their custom solution or made use of some third party component. Luckily .NET framework 3.5 introduced a set of classes that can simplify your job. This article explains how.