If you have a blog and are interested in stats like how many people subscribe, what searches show up your blog posts and other web admin type numbers then check out the new Google Webmaster Tools.
You will have to verify your website is yours by adding a meta tag to the head element of your home page or uploading an HTML page. I went with the meta tag because that's much easier in Blogger. This can be done for sites not hosted by Google and is easy for those who already have a Google account. I prefer it to FeedBurner, mainly because I don't have to create another account.
I sure wish the rest of you dozens and hundreds of reader would subscribe to me already so I feel loved :o) BTW, I use Google Reader.
Image from http://www.omniauto.it/2.0/images/rss_big.jpg