Many might feel that the use of buttons to provide links is waste of resources as a simple HTML link would suffice. Indeed these buttons are taxing not only on one server but on many as they can be present on different servers as well.
But still we use them and use them with joy...Now i add more buttons for RSS feed for the worlds longest sidebar.What is RSS?
RSS stands for "Really Simple Syndication" -- it's a format for distributing and gathering content from sources across the Web, including newspapers, magazines, and blogs. RSS readers are plenty. Take a look at the google reader button. Its also a online feed reader. It is still supossed to be in the "lab" stage though.