Did you ever wonder how much bandwidth your linux server is using each month, or each day? There are a number of tools that can give you this information, but many of them are packet sniffers, and can effect performance.

One of the things you will notice after you have published an rss feed is that it will consume a lot of the bandwidth. For example on Spendfish.com 18% of the requests are for RSS feeds. This is no wonder since feed readers may download your feed several times a day even if nothing has changed.